neovim plugin infrastructure

[teto]

Issue description

As reported in #178180 (comment), buildNeovimPluginFrom2Nix (currently) ignores the "src" which is confusing.

nixpkgs/pkgs/applications/editors/vim/plugins/generated.nix

Line 3156 in 551e65e

Solutions:

1. either dont write src so it's clear we are using the version from the lua package
2. we use the "src" version but it means we need

This is sthg I am invested in so I've assigned it to myself.

[miuirussia]

How to build custom plugin with lua, which not included in nixpkgs? I used buildVimPluginFrom2Nix, but now it won't load lua package

[teto]

@miuirussia your question is a bit orthogonal, maybe ask on the discourse instead. You may find info here #126633

[teto]

a few plugins to add to lua

• feat: add rockspec hrsh7th/nvim-cmp#1051
• adding rockspec rktjmp/lush.nvim#58
• rockspec: add missing dependency plenary rest-nvim/rest.nvim#129
• treesitter build: add a rockspec nvim-treesitter/nvim-treesitter#3477

[teto]

the process should be clearer now that staging was merged.