WCAG color contrast theme

[bilalbhojani24]

Is your feature request related to a problem? Please describe.
I was trying multiple theme's provided by library from HLJS or Prism, but no styles were following WCAG colour contrast. Apart from A11YLight and A11YDark, I couldn't find any which supports highlighting on functionsNames, variables, classNames of Java, CSharp etc.

Describe the solution you'd like
I have planned to create a new theme on the top of one-light theme which fixes WCAG colour contrast issue.

Sandbox link : https://codesandbox.io/p/sandbox/syntax-highlighter-theme-wcag-compatible-forked-f3j9kw?file=%2Fsrc%2Fcomponents%2FCodeblock%2FoneLightWCAG.ts%3A8%2C28

Describe alternatives you've considered
NA

Additional context
NA

[bilalbhojani24]

I have created a PR to support the above feature i.e. support A11Y in one-light theme naming (a11yOneLight) which is WCAG colour contrast fit and supports keyword highlighting in all languages.

PR: #534