feat(preset-web-fonts): use woff2 compatible user-agent

[0xb4lint]

The most commonly used web font provider is Google Fonts and they are differentiating the CSS response based on the User-Agent header.

If the user agent supports woff2 format then the CSS response will contain woff2 font definitions.
woff2 is using Brotli compression, which is far more efficient than ttf, able to use unicode-range (font chunks) and it's supported >96% of browsers.

Currently the @unocss/preset-web-fonts is fetching web font CSS using ohmyfetch library without setting any user agent, that's why Google Fonts will serve a CSS with ttf fonts.

Example injected web font definitions by web-fonts preset:

 @font-face {  font-family: 'Fira Code';  font-style: normal;  font-weight: 400;  font-display: swap;  src: url(https://fonts.gstatic.com/s/firacode/v21/uU9eCBsR6Z2vfE9aq3bL0fxyUs4tcw4W_D1sFVc.ttf) format('truetype');}
 @font-face {  font-family: 'Fira Mono';  font-style: normal;  font-weight: 400;  font-display: swap;  src: url(https://fonts.gstatic.com/s/firamono/v14/N0bX2SlFPv1weGeLZDtQIQ.ttf) format('truetype');}
 @font-face {  font-family: 'Fira Mono';  font-style: normal;  font-weight: 700;  font-display: swap;  src: url(https://fonts.gstatic.com/s/firamono/v14/N0bS2SlFPv1weGeLZDtondv3mQ.ttf) format('truetype');}
 @font-face {  font-family: 'Lato';  font-style: italic;  font-weight: 400;  font-display: swap;  src: url(https://fonts.gstatic.com/s/lato/v23/S6u8w4BMUTPHjxswWw.ttf) format('truetype');}
 @font-face {  font-family: 'Lato';  font-style: italic;  font-weight: 700;  font-display: swap;  src: url(https://fonts.gstatic.com/s/lato/v23/S6u_w4BMUTPHjxsI5wqPHA.ttf) format('truetype');}
 @font-face {  font-family: 'Lato';  font-style: normal;  font-weight: 400;  font-display: swap;  src: url(https://fonts.gstatic.com/s/lato/v23/S6uyw4BMUTPHvxk.ttf) format('truetype');}
 @font-face {  font-family: 'Lato';  font-style: normal;  font-weight: 700;  font-display: swap;  src: url(https://fonts.gstatic.com/s/lato/v23/S6u9w4BMUTPHh6UVew8.ttf) format('truetype');}
 @font-face {  font-family: 'Lobster';  font-style: normal;  font-weight: 400;  font-display: swap;  src: url(https://fonts.gstatic.com/s/lobster/v28/neILzCirqoswsqX9_oU.ttf) format('truetype');}
 @font-face {  font-family: 'Roboto';  font-style: normal;  font-weight: 400;  font-display: swap;  src: url(https://fonts.gstatic.com/s/roboto/v30/KFOmCnqEu92Fr1Me5Q.ttf) format('truetype');}

With this PR the injected font definitions will be the following:

/* cyrillic-ext */
@font-face {  font-family: 'Fira Code';  font-style: normal;  font-weight: 400;  font-display: swap;  src: url(https://fonts.gstatic.com/s/firacode/v21/uU9eCBsR6Z2vfE9aq3bL0fxyUs4tcw4W_D1sJV37Nv7g.woff2) format('woff2');  unicode-range: U+0460-052F, U+1C80-1C88, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F;}
/* cyrillic */
@font-face {  font-family: 'Fira Code';  font-style: normal;  font-weight: 400;  font-display: swap;  src: url(https://fonts.gstatic.com/s/firacode/v21/uU9eCBsR6Z2vfE9aq3bL0fxyUs4tcw4W_D1sJVT7Nv7g.woff2) format('woff2');  unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;}
/* greek-ext */
@font-face {  font-family: 'Fira Code';  font-style: normal;  font-weight: 400;  font-display: swap;  src: url(https://fonts.gstatic.com/s/firacode/v21/uU9eCBsR6Z2vfE9aq3bL0fxyUs4tcw4W_D1sJVz7Nv7g.woff2) format('woff2');  unicode-range: U+1F00-1FFF;}
/* greek */
@font-face {  font-family: 'Fira Code';  font-style: normal;  font-weight: 400;  font-display: swap;  src: url(https://fonts.gstatic.com/s/firacode/v21/uU9eCBsR6Z2vfE9aq3bL0fxyUs4tcw4W_D1sJVP7Nv7g.woff2) format('woff2');  unicode-range: U+0370-03FF;}
/* latin-ext */
@font-face {  font-family: 'Fira Code';  font-style: normal;  font-weight: 400;  font-display: swap;  src: url(https://fonts.gstatic.com/s/firacode/v21/uU9eCBsR6Z2vfE9aq3bL0fxyUs4tcw4W_D1sJV77Nv7g.woff2) format('woff2');  unicode-range: U+0100-024F, U+0259, U+1E00-1EFF, U+2020, U+20A0-20AB, U+20AD-20CF, U+2113, U+2C60-2C7F, U+A720-A7FF;}
/* latin */
@font-face {  font-family: 'Fira Code';  font-style: normal;  font-weight: 400;  font-display: swap;  src: url(https://fonts.gstatic.com/s/firacode/v21/uU9eCBsR6Z2vfE9aq3bL0fxyUs4tcw4W_D1sJVD7Ng.woff2) format('woff2');  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;}
/* cyrillic-ext */
@font-face {  font-family: 'Fira Mono';  font-style: normal;  font-weight: 400;  font-display: swap;  src: url(https://fonts.gstatic.com/s/firamono/v14/N0bX2SlFPv1weGeLZDtgK_7SodY.woff2) format('woff2');  unicode-range: U+0460-052F, U+1C80-1C88, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F;}
/* cyrillic */
@font-face {  font-family: 'Fira Mono';  font-style: normal;  font-weight: 400;  font-display: swap;  src: url(https://fonts.gstatic.com/s/firamono/v14/N0bX2SlFPv1weGeLZDtgIv7SodY.woff2) format('woff2');  unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;}
/* greek-ext */
@font-face {  font-family: 'Fira Mono';  font-style: normal;  font-weight: 400;  font-display: swap;  src: url(https://fonts.gstatic.com/s/firamono/v14/N0bX2SlFPv1weGeLZDtgKv7SodY.woff2) format('woff2');  unicode-range: U+1F00-1FFF;}
/* greek */
@font-face {  font-family: 'Fira Mono';  font-style: normal;  font-weight: 400;  font-display: swap;  src: url(https://fonts.gstatic.com/s/firamono/v14/N0bX2SlFPv1weGeLZDtgJf7SodY.woff2) format('woff2');  unicode-range: U+0370-03FF;}
/* latin-ext */
@font-face {  font-family: 'Fira Mono';  font-style: normal;  font-weight: 400;  font-display: swap;  src: url(https://fonts.gstatic.com/s/firamono/v14/N0bX2SlFPv1weGeLZDtgKP7SodY.woff2) format('woff2');  unicode-range: U+0100-024F, U+0259, U+1E00-1EFF, U+2020, U+20A0-20AB, U+20AD-20CF, U+2113, U+2C60-2C7F, U+A720-A7FF;}
/* latin */
@font-face {  font-family: 'Fira Mono';  font-style: normal;  font-weight: 400;  font-display: swap;  src: url(https://fonts.gstatic.com/s/firamono/v14/N0bX2SlFPv1weGeLZDtgJv7S.woff2) format('woff2');  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;}
/* cyrillic-ext */
@font-face {  font-family: 'Fira Mono';  font-style: normal;  font-weight: 700;  font-display: swap;  src: url(https://fonts.gstatic.com/s/firamono/v14/N0bS2SlFPv1weGeLZDtondvHk_fUWZA.woff2) format('woff2');  unicode-range: U+0460-052F, U+1C80-1C88, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F;}
/* cyrillic */
@font-face {  font-family: 'Fira Mono';  font-style: normal;  font-weight: 700;  font-display: swap;  src: url(https://fonts.gstatic.com/s/firamono/v14/N0bS2SlFPv1weGeLZDtondvHmvfUWZA.woff2) format('woff2');  unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;}
/* greek-ext */
@font-face {  font-family: 'Fira Mono';  font-style: normal;  font-weight: 700;  font-display: swap;  src: url(https://fonts.gstatic.com/s/firamono/v14/N0bS2SlFPv1weGeLZDtondvHkvfUWZA.woff2) format('woff2');  unicode-range: U+1F00-1FFF;}
/* greek */
@font-face {  font-family: 'Fira Mono';  font-style: normal;  font-weight: 700;  font-display: swap;  src: url(https://fonts.gstatic.com/s/firamono/v14/N0bS2SlFPv1weGeLZDtondvHnffUWZA.woff2) format('woff2');  unicode-range: U+0370-03FF;}
/* latin-ext */
@font-face {  font-family: 'Fira Mono';  font-style: normal;  font-weight: 700;  font-display: swap;  src: url(https://fonts.gstatic.com/s/firamono/v14/N0bS2SlFPv1weGeLZDtondvHkPfUWZA.woff2) format('woff2');  unicode-range: U+0100-024F, U+0259, U+1E00-1EFF, U+2020, U+20A0-20AB, U+20AD-20CF, U+2113, U+2C60-2C7F, U+A720-A7FF;}
/* latin */
@font-face {  font-family: 'Fira Mono';  font-style: normal;  font-weight: 700;  font-display: swap;  src: url(https://fonts.gstatic.com/s/firamono/v14/N0bS2SlFPv1weGeLZDtondvHnvfU.woff2) format('woff2');  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;}
/* latin-ext */
@font-face {  font-family: 'Lato';  font-style: italic;  font-weight: 400;  font-display: swap;  src: url(https://fonts.gstatic.com/s/lato/v23/S6u8w4BMUTPHjxsAUi-qJCY.woff2) format('woff2');  unicode-range: U+0100-024F, U+0259, U+1E00-1EFF, U+2020, U+20A0-20AB, U+20AD-20CF, U+2113, U+2C60-2C7F, U+A720-A7FF;}
/* latin */
@font-face {  font-family: 'Lato';  font-style: italic;  font-weight: 400;  font-display: swap;  src: url(https://fonts.gstatic.com/s/lato/v23/S6u8w4BMUTPHjxsAXC-q.woff2) format('woff2');  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;}
/* latin-ext */
@font-face {  font-family: 'Lato';  font-style: italic;  font-weight: 700;  font-display: swap;  src: url(https://fonts.gstatic.com/s/lato/v23/S6u_w4BMUTPHjxsI5wq_FQft1dw.woff2) format('woff2');  unicode-range: U+0100-024F, U+0259, U+1E00-1EFF, U+2020, U+20A0-20AB, U+20AD-20CF, U+2113, U+2C60-2C7F, U+A720-A7FF;}
/* latin */
@font-face {  font-family: 'Lato';  font-style: italic;  font-weight: 700;  font-display: swap;  src: url(https://fonts.gstatic.com/s/lato/v23/S6u_w4BMUTPHjxsI5wq_Gwft.woff2) format('woff2');  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;}
/* latin-ext */
@font-face {  font-family: 'Lato';  font-style: normal;  font-weight: 400;  font-display: swap;  src: url(https://fonts.gstatic.com/s/lato/v23/S6uyw4BMUTPHjxAwXjeu.woff2) format('woff2');  unicode-range: U+0100-024F, U+0259, U+1E00-1EFF, U+2020, U+20A0-20AB, U+20AD-20CF, U+2113, U+2C60-2C7F, U+A720-A7FF;}
/* latin */
@font-face {  font-family: 'Lato';  font-style: normal;  font-weight: 400;  font-display: swap;  src: url(https://fonts.gstatic.com/s/lato/v23/S6uyw4BMUTPHjx4wXg.woff2) format('woff2');  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;}
/* latin-ext */
@font-face {  font-family: 'Lato';  font-style: normal;  font-weight: 700;  font-display: swap;  src: url(https://fonts.gstatic.com/s/lato/v23/S6u9w4BMUTPHh6UVSwaPGR_p.woff2) format('woff2');  unicode-range: U+0100-024F, U+0259, U+1E00-1EFF, U+2020, U+20A0-20AB, U+20AD-20CF, U+2113, U+2C60-2C7F, U+A720-A7FF;}
/* latin */
@font-face {  font-family: 'Lato';  font-style: normal;  font-weight: 700;  font-display: swap;  src: url(https://fonts.gstatic.com/s/lato/v23/S6u9w4BMUTPHh6UVSwiPGQ.woff2) format('woff2');  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;}
/* cyrillic-ext */
@font-face {  font-family: 'Lobster';  font-style: normal;  font-weight: 400;  font-display: swap;  src: url(https://fonts.gstatic.com/s/lobster/v28/neILzCirqoswsqX9zo-mM5Ez.woff2) format('woff2');  unicode-range: U+0460-052F, U+1C80-1C88, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F;}
/* cyrillic */
@font-face {  font-family: 'Lobster';  font-style: normal;  font-weight: 400;  font-display: swap;  src: url(https://fonts.gstatic.com/s/lobster/v28/neILzCirqoswsqX9zoamM5Ez.woff2) format('woff2');  unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;}
/* vietnamese */
@font-face {  font-family: 'Lobster';  font-style: normal;  font-weight: 400;  font-display: swap;  src: url(https://fonts.gstatic.com/s/lobster/v28/neILzCirqoswsqX9zo2mM5Ez.woff2) format('woff2');  unicode-range: U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+1EA0-1EF9, U+20AB;}
/* latin-ext */
@font-face {  font-family: 'Lobster';  font-style: normal;  font-weight: 400;  font-display: swap;  src: url(https://fonts.gstatic.com/s/lobster/v28/neILzCirqoswsqX9zoymM5Ez.woff2) format('woff2');  unicode-range: U+0100-024F, U+0259, U+1E00-1EFF, U+2020, U+20A0-20AB, U+20AD-20CF, U+2113, U+2C60-2C7F, U+A720-A7FF;}
/* latin */
@font-face {  font-family: 'Lobster';  font-style: normal;  font-weight: 400;  font-display: swap;  src: url(https://fonts.gstatic.com/s/lobster/v28/neILzCirqoswsqX9zoKmMw.woff2) format('woff2');  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;}
/* cyrillic-ext */
@font-face {  font-family: 'Roboto';  font-style: normal;  font-weight: 400;  font-display: swap;  src: url(https://fonts.gstatic.com/s/roboto/v30/KFOmCnqEu92Fr1Mu72xKOzY.woff2) format('woff2');  unicode-range: U+0460-052F, U+1C80-1C88, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F;}
/* cyrillic */
@font-face {  font-family: 'Roboto';  font-style: normal;  font-weight: 400;  font-display: swap;  src: url(https://fonts.gstatic.com/s/roboto/v30/KFOmCnqEu92Fr1Mu5mxKOzY.woff2) format('woff2');  unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;}
/* greek-ext */
@font-face {  font-family: 'Roboto';  font-style: normal;  font-weight: 400;  font-display: swap;  src: url(https://fonts.gstatic.com/s/roboto/v30/KFOmCnqEu92Fr1Mu7mxKOzY.woff2) format('woff2');  unicode-range: U+1F00-1FFF;}
/* greek */
@font-face {  font-family: 'Roboto';  font-style: normal;  font-weight: 400;  font-display: swap;  src: url(https://fonts.gstatic.com/s/roboto/v30/KFOmCnqEu92Fr1Mu4WxKOzY.woff2) format('woff2');  unicode-range: U+0370-03FF;}
/* vietnamese */
@font-face {  font-family: 'Roboto';  font-style: normal;  font-weight: 400;  font-display: swap;  src: url(https://fonts.gstatic.com/s/roboto/v30/KFOmCnqEu92Fr1Mu7WxKOzY.woff2) format('woff2');  unicode-range: U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+1EA0-1EF9, U+20AB;}
/* latin-ext */
@font-face {  font-family: 'Roboto';  font-style: normal;  font-weight: 400;  font-display: swap;  src: url(https://fonts.gstatic.com/s/roboto/v30/KFOmCnqEu92Fr1Mu7GxKOzY.woff2) format('woff2');  unicode-range: U+0100-024F, U+0259, U+1E00-1EFF, U+2020, U+20A0-20AB, U+20AD-20CF, U+2113, U+2C60-2C7F, U+A720-A7FF;}
/* latin */
@font-face {  font-family: 'Roboto';  font-style: normal;  font-weight: 400;  font-display: swap;  src: url(https://fonts.gstatic.com/s/roboto/v30/KFOmCnqEu92Fr1Mu4mxK.woff2) format('woff2');  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;}

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