languages/qml: add QML support

[TheSunCat]

This merge request adds support for the qmlls LSP and qmlformat formatter in nvf, toggleable with languages.qml options. The implementation is largely based off of the clang.nix (LSP) and svelte.nix (formatter) files, as I am still new-ish to the Nix language, but I think most of the code makes sense.

Note that qmlls requires passing the -E argument to have it read the QML2_IMPORT_PATH environment variable, which is required for the ability to import QML modules on NixOS (they are installed in the Nix store).

Sanity Checking

• I have updated the changelog as per my changes
• I have tested, and self-reviewed my code
• My changes fit guidelines found in hacking nvf
• Style and consistency
  • I ran Alejandra to format my code (nix fmt)
  • My code conforms to the editorconfig configuration of the project
  • My changes are consistent with the rest of the codebase
• If new changes are particularly complex:
  • My code includes comments in particularly complex areas
  • I have added a section in the manual
  • (For breaking changes) I have included a migration guide
• Package(s) built:
  • .#nix (default package)
  • .#maximal
  • .#docs-html (manual, must build)
  • .#docs-linkcheck (optional, please build if adding links)
• Tested on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin

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Debug Information

Triggered by: TheSunCat

HEAD at: feat-languages-qml

Reruns: 326