feat(perf): lazy embed languages bundle for SFCs and Docs

[antfu]

This PR introduces an optimization to load and bundle embedded languages lazily for some languages.

For example, in Vue SFC, you can have <script lang="tsx">, <template lang="pug">, <style lang="scss"> to embed different languages in Vue files. This means to support properly support them, when loading Vue's grammar, it will also load tsx, jsx, pug, coffee, scss, sass, less... as it's dependencies - even you might not need most of the languages.

In this PR, we make those embedded languages as lazy dependencies, meaning they are not initiated along with vue. Instead, you need to load the corresponding languages alongside them to get those embedded blocks properly highlighted. We consider this as a performance improvement on both runtime and bundle size, as this would only affect fine-grain bundle, and users should already loading the languages they needed in those cases.

The same optimization applies to vue, vue-html, astro, svelte, pug, haml, wikitext, latex, asciidoc. And markdown, mdx already worked that way.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.88%. Comparing base (92fec4a) to head (e696387).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #791      +/-   ##
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+ Coverage   92.79%   92.88%   +0.08%     
==========================================
  Files          76       76              
  Lines        4597     4597              
  Branches     1020     1020              
==========================================
+ Hits         4266     4270       +4     
+ Misses        322      318       -4     
  Partials        9        9              

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