treesitter: add compatibility layer for master

[HeitorAugustoLN]

Add a compatibility layer for master branch, both for 25.11 users and unstable which want to keep using nvim-treesitter-legacy package

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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[snoweuph]

thanks for trying to contribute.

FYI, the CI is still failing on this.

I suggest you rebase it, and possibly turn it into a draft till its actually ready?

[HeitorAugustoLN]

I am pretty sure the CI failure was a false positive, though the logs have expired. Not sure this PR is needed now after 6 months, most people should have moved on already

[snoweuph]

welp, cant wait till we need a migration to an nvim treesitter replacement now that its archived

[HeitorAugustoLN]

At least it will be maintained by upstream like nvim-lspconfig, so it should be the last time