feat: add angular-language-server extension v1.0.0

[pBouillon]

I work with Angular almost daily and originally developed this to support my own development needs. This project was initially inspired by nathansbradshaw/zed-angular, but the implementation drifted significantly as I learned my way through the Zed API, Rust, and Tree-sitter. Contributing the changes back would have meant opening a pull request replacing most of the existing codebase, which did not feel like the right thing to do as an external contributor.

Once I had a working version, I noticed the original author mentioned they no longer work with Angular actively. This encouraged me to refine this into a formal extension for others to use.

This extension offers:

• Support for Angular-flavored HTML both in standalone files and inline within TypeScript files
• Highlighting and outline support for the latest Angular tokens and control flow syntax (e.g., @if, @for)

Compared to the existing extension, this version introduces a few functional differences:

• Support for silencing specific Angular diagnostic messages directly via the extension's settings
• Prioritizes existing node packages within the repository to avoid unnecessary re-downloads, looking at a node_module in the project root
• Uses the Angular compatibility matrix to resolve the correct version of the Angular Language Service and TypeScript based on the local project environment.

I am aware the contribution guidelines generally discourage duplicate extensions. I hope the differences outlined above make a reasonable case for this one to be listed alongside the existing extension rather than as a replacement for it.

If this is not something the Zed team wishes to include as a separate extension at this time, I completely understand. Regardless of the outcome, thank you for your time and for the work you put into reviewing these contributions.

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[pBouillon]

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[pBouillon]

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