Integrate Volar for the built-in HTML Extension

[johnsoncodehk]

This PR tries to implement html-language-features with Volar.js, which is the framework used by Vue - Official, MDX, Astro behind the scenes. Compared with the original implementation, supporting embedded documents should be much simpler.

Preview Extension: johnsoncodehk#1

Features / Bug Fixes

• Support auto-complete of TS directive comments (@ts-ignore, @ts-expecte-error...)
• Support path completion in script tag import statement
• Support built-in types/jquery types definition jump
• Localized TS diagnostic message
• Fixes [html] Javascript intellisense in inline scripts from external references #26338
• Fixes [html] support 'import' in <script type=module> tags #29315
• Fixes [html] provide rename for embedded JavaScript #31141 (Cross file renaming)
• Fixes [html] JSON edit support inside HTML document / script tag with type="application/json" #36280
• Fixes [html] Support SCSS in HTML with <style type="text/scss"> #57469
• Fixes [html] support less syntax in html file #59445
• Fixes [html] don't let '/' trigger a suggest in embedded JavaScript #97949
• Fixes [html] Unecessary warning when script contains quotes on the same line as an onFoo attribute using the same quotes #109092
• Fixes [html] support imports in embedded JavaScript #114115
• Fixes [html] Unexpected "Declaration or statement expected" in HTML code #135849
• Fixes [html] "Cannot redeclare block-scoped variable" in script type module #169117
  • Fixes Invalid error message: "Cannot redeclare block-scoped variable" vscode-html-languageservice#133
• Fixes [html] Format does not work if script tag parameters do not have quotes #210303
• Fixes [html] Formatting Breaks with Space Between Commented Lines in Script Tag #213628
• Fixes [html] Vscode detect wrong scope for script with type=module #229357
• Fixes CSS Lint Unknown Properties doesn't ignore warnings #241481
• Fixes Global library type declarations not recognized in inline <script> tags #250216

[aeschli]

That's really cool, well architectured.
It would be great if we could switch to such a setup and profit from your work. The main challenge is of course that we would rely on a code base that is all owned by volar. I'll bring it up for discussion with the team here and we see what can be done.

[laundmo]

This would be great to have - was there any decision by the team?

[johnsoncodehk]

If anyone wants to test this, you can find the preview extension here: johnsoncodehk#1