This PR adds fish language support

Fixes #792

Testing:

Tested my changes by changing the nvf url to the branch from my fork

nvf.url = "github:venkyr77/nvf/fish-lsp";

with config.vim.languages.fish.treesitter.enable = false,

with config.vim.languages.fish.treesitter.enable = true,

with config.vim.languages.fish.lsp.enable = false,

with config.vim.languages.fish.lsp.enable = true,

with config.vim.languages.fish.format.enable = false,

:ConformInfo shows

Formatters for this buffer:
LSP: fish_lsp

with config.vim.languages.fish.format.enable = true,

:ConformInfo shows

Formatters for this buffer:
LSP: fish_lsp
fish_indent ready (fish) /nix/store/j2qz2d900y518k2hq6myl60g2vyh7l19-fish-4.0.1/bin/fish_indent

after :lua require("conform").format(),

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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