Re-write using Volar: initially only supporting .gts

[machty]

This PR rebuilds Glint atop Volar.js, a language tooling framework used by Vue and many others.

The focus for this PR is to get Volar working with initial support only for .gts/.gjs files, i.e. a modern Polaris-edition Ember.js app. Support for classic two-file components will be investigated at a later date (but I am optimistic we can support that too).

Gameplan / TODO

• Basic implementation for .gts VirtualCodes such that type-checking works in a .gts file with near feature parity for glint-main
• reinstate augmentation for things like "Expected 2 arguments, but got 3. Note that named args are passed together as a final argument, so they collectively increase the given arg count by 1."
• basic glint as tsc support
• clean up and squash PR
• re-enable CI lints
• Passing tests for .gts files
• Figure out how to resolve conflicts/overlapping with vsc-ember-syntax Transfer to ember-tooling lifeart/vsc-ember-syntax#72
  • I need to review how/why I inlined portions of that addon into this branch; I believe it's because otherwise Glint/Volar can't determine a language ID for .gts files

Likely save for future PR

• get all {{ @glint-expect-error }} and related directives working
• Support for .gjs (and passing tests)
• Fix all CLI specs
• Support for .hbs and companion files
• constrain data objects on nested embedded codes https://discord.com/channels/1192759067815464990/1252021970443440128/1252298644695158874

[NullVoxPopuli]

I'm merging this with red status, with the understanding that we're not going to release a stable v2 until the tests are green, and some more features are implemented (I've talked with @machty about this, and the goal here is to just get folks trying out Volar for some early feedback).

Next, I'm going to set up unstable releases like we have on embroider.
Standby.