Add huff language

[mmsaki]

Description

Checklist:

• I am adding a new language.
  • The extension of the new language is used in hundreds of repositories on GitHub.com.
    • Search results for each extension:
      • https://github.com/search?type=code&q=NOT+is%3Afork+path%3A*.huff+#define
  • I have included a real-world usage sample for all extensions added in this PR:
    • Sample source(s):
      • huff-language/huff-docs
    • Sample license(s): MIT
  • I have included a syntax highlighting grammar: mmsaki/huff-treesitter
  • I have added a color
    • Hex value: #4242C7
    • Rationale: This color hex code is used as the icon color for huff file extensions in dev-icons repo nvim-web-devicons/lua/nvim-web-devicons/light/icons_by_file_extension.lua
  • I have updated the heuristics to distinguish my language from others using the same extension.

[lildude]

This is a duplicate of #6470