languages/tera: add syntax highlighting support for tera templating

[snoweuph]

Adds Syntax highlighting support for the tera language: https://keats.github.io/tera/
As of right now, there doesn't seem to be a formmatter or lsp specificly available for tera.

a jinja2/twig formatter should work fine for most cases, but still are quite off, so im not adding them in this.

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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[github-actions]

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Debug Information

Triggered by: NotAShelf

HEAD at: feature/tera

Reruns: 1744

[NotAShelf]

LGTM, but needs an entry in the 0.9 changelog.

[snoweuph]

Wont be back at a pc till 3.1.26 so either anbody else can add the changelog or I do it then

[snoweuph]

done