refactor: unocss plugin with vite plugin and webpack plugin

[wkeylin]

问题

原来的unocss-plugin基于@unocss/cli，在编译前拿到uno.css，但是unocss新的一些transformer能力cli无法支持，比如Variant Groups, CSS Directives

方案

用unocss提供的vite plugin和webpack plugin对unocss plugin进行重构支持这些能力

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View rendered docs/docs/guides/styling.md

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Name	Status	Preview	Updated
umi	✅ Ready (Inspect)	Visit Preview	Sep 21, 2022 at 1:46AM (UTC)

[codecov]

Codecov Report

Base: 29.38% // Head: 29.37% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (1836a75) compared to base (b67d8e6).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9324      +/-   ##
==========================================
- Coverage   29.38%   29.37%   -0.01%     
==========================================
  Files         413      413              
  Lines       11479    11482       +3     
  Branches     2740     2742       +2     
==========================================
  Hits         3373     3373              
- Misses       7596     7598       +2     
- Partials      510      511       +1     

Impacted Files	Coverage Δ
packages/plugins/src/unocss.ts	0.00% <0.00%> (ø)

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[LanJamRom]

为什么关闭了？@apply 还是挺常用的

[wkeylin]

为什么关闭了？@apply 还是挺常用的

unocss/webpack插件的缓存有问题，二次编译没有生成uno.css，umi也没有提供关闭缓存的配置

[wkeylin]

为什么关闭了？@apply 还是挺常用的

而且unocss/cli我已经提了pr支持了transform的能力了，只不过会改变源码 unocss/unocss#1592 webpack插件的坑一时半会填不完

[LanJamRom]

示例 更新了cli版本，directives transformer 也不生效，跟umi有关系吗？

[wkeylin]

示例 更新了cli版本，directives transformer 也不生效，跟umi有关系吗？

可以加一下这个配置试试，可能是directives transformer默认排除了样式文件

include: [/src.*\.([jt]sx|less)$/],
exclude: [],