feat: extract API component as a plugin

[mortalYoung]

🤔 这个变动的性质是？/ What is the nature of this change?

• 新特性提交 / New feature

🔗 相关 Issue / Related Issue

💡 需求背景和解决方案 / Background or solution

• 基于 feat: support to register markdown component #933 实现的编译时组件能力，将内置的 API 组件抽出，用插件的方式实现实现
• 由于 [WIP]: feat: support to register markdown component #921 的改动较大，故拆分出此 PR 以供 review

📝 更新日志 / Changelog

Language	Changelog
🇺🇸 English	extract API component as a plugin
🇨🇳 Chinese	将内置 API 组件抽离成插件

[github-actions]

🎊 PR Preview has been successfully built and deployed to https://dumi-preview-pr-953.surge.sh

[github-actions]

🎊 PR Mobile Preview has been successfully built and deployed to https://dumi-mobile-preview-pr-953.surge.sh

[mortalYoung]

看了一下还是挺大的，🤣
建议是 review 的时候 select commit 一下，每次 commit 都只做一件事，应该会直观一点🥶

[codecov]

Codecov Report

Merging #953 (ad79e04) into master (37666de) will increase coverage by 0.11%.
The diff coverage is 100.00%.

❗ Current head ad79e04 differs from pull request most recent head 6f8e6d3. Consider uploading reports for the commit 6f8e6d3 to get more accurate results

@@            Coverage Diff             @@
##           master     #953      +/-   ##
==========================================
+ Coverage   94.74%   94.86%   +0.11%     
==========================================
  Files         117      116       -1     
  Lines        2857     2845      -12     
  Branches      972      970       -2     
==========================================
- Hits         2707     2699       -8     
+ Misses        146      142       -4     
  Partials        4        4              

Impacted Files	Coverage Δ
packages/preset-dumi/src/index.ts	100.00% <ø> (ø)
packages/preset-dumi/src/theme/loader.ts	96.20% <ø> (ø)
...ckages/preset-dumi/src/transformer/remark/index.ts	100.00% <ø> (ø)
packages/plugin-dumi-api/src/API.tsx	100.00% <100.00%> (ø)
packages/plugin-dumi-api/src/index.ts	100.00% <100.00%> (ø)
packages/plugin-dumi-api/src/parser.ts	100.00% <100.00%> (ø)
packages/plugin-dumi-api/src/useApiData.ts	100.00% <100.00%> (ø)
packages/preset-dumi/src/theme/layout.tsx	86.88% <0.00%> (-0.42%)	⬇️
packages/preset-dumi/src/loader/index.ts	100.00% <0.00%> (ø)
... and 7 more

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[mortalYoung]

theme.ts#L73 这里的逻辑和目前自定义编译组件的逻辑无法自洽，需要做改造，看下如何改比较好
cc @PeachScript

[PeachScript]

❤️ 感谢贡献，dumi v1 不再更新，PR 将会关闭；dumi v2 已发布，欢迎继续参与 dumi 的建设，https://d.umijs.org/