Add Glimmer TS language

[gilest]

Description

Adds support for TypeScript-flavoured Glimmer.js which will be the component authoring format of the next Edition of Ember.js.

Checklist:

• [x] I am adding a new language.
  • [x] The extension of the new language is used in hundreds of repositories on GitHub.com.
    • Search results for each extension:
      • .gts search 2k files excluding forks
  • [x] I have included a real-world usage sample for all extensions added in this PR:
    • Sample source(s):
      • class.gts
      • template-only.gts
    • Sample license(s):
      • class.gts -(https://github.com/cardstack/cardstack) MIT
      • template-only.gjs (https://github.com/CrowdStrike/opensource.crowdstrike.com) MIT
  • [x] I have added a color
    • Hex value: #3178c6
    • Rationale: TypeScript colour which is also used by TypeScript and TSX
  • [x] I have updated the heuristics to distinguish my language from others using the same extension.

[gilest]

CI is failing because the vscode-vba repo has been removed from GitHub

[lildude]

All should be good now I've merged https://github.com/github-linguist/linguist/pull/6678

[deanylev]

Is this able to be merged? Reviewing our gts files in PRs is a nightmare at the moment 🙏

[gilest]

Is this able to be merged? Reviewing our gts files in PRs is a nightmare at the moment 🙏

Appreciate your anticipation @deanylev

According to the Lingust docs

Changes to Linguist will only appear on GitHub when a new Linguist release is made and this is deployed to GitHub.com. There is no set release timeframe, but the intention is at least once every three-to-four months...

So even if this PR is merged, we'll be waiting for the next Lingust release which may be in March/April 🙂

[Techn1x]

Looking forward to this as well. For what it's worth, we have 300+ GTS files in a private repo.