typespec: init at 0.64.0

[PauKaifler]

This PR adds typespec, a compiler with included language server for defining API shapes for REST, OpenAPI, gRPC and others.
We have been using this derivation at work for some time and it worked well.

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 25.05 Release Notes (or backporting 24.11 and 25.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

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[pluiedev]

Welcome to Nixpkgs ❤️ Just a couple of things:

[PauKaifler]

Thanks for your quick review! I implemented your suggestions.

[steeleduncan]

As the root repository has github releases, I believe you could add an update script

https://wiki.nixos.org/wiki/Nixpkgs/Update_Scripts

That would simplify updates as they'll be generated automatically by a bot

[PauKaifler]

As the root repository has github releases, I believe you could add an update script

Good idea, thanks. I now added one.

[steeleduncan]

@PauKaifler By the way, it has been a while, and this risks getting lost in the sea of nixpkgs PRs. My suggestion would be to find someone who has merged a similar package into nixpkgs recently, and request a review from them

[PauKaifler]

I implemented the recommendations given by @wolfgangwalther and rebased to master.

Since this PR has been opened, a new TypeSpec version has been released (0.63.0).
Should I create a new PR with the version and hashes changed, or is it preferable to directly update this one?

[wolfgangwalther]

Should I create a new PR with the version and hashes changed, or is it preferable to directly update this one?

Please update this one.

[PauKaifler]

Thanks for the heads-up, @gepbird. I applied the change.

Also, I updated TypeSpec to 0.64.0 because there has been a new release yesterday.