Nvim Treesitter support

Not sure if I should post it here, but the tree-sitter build-in neovim doesn't support rescript. It's a great improvement for color highlight and other plugins features ( I think about blankline or telescope preview for example).
With the recent release of nvim 0.5, it's now a must have.

If we look at the elm way, they have a dedicated repo: https://github.com/elm-tooling/tree-sitter-elm for the "regular" tree-sitter as a common based, then we can have the slightly different version targeting nvim as explain here: https://github.com/nvim-treesitter/nvim-treesitter/issues/529

Posting it here, as vs code took the opposite way to deprecied tree-sitter so it primaly focus neovim. Also, the current highlight syntax have some issue, it can fixed it at least for neovim, in what it seems to be an easier way than through LSP.

I will probably not have time to take care of it, but I post it here for the record anymway.

まず、vim-rescript リポジトリの現在のハイライト構文と、参照されている Elm tree-sitter および nvim-treesitter のアプローチを確認します。完了条件は、実行可能な Neovim の Tree-sitter サポート方法を文書化または実装し、報告されているハイライトの制限に対処したうえで、結果を要求された Neovim の機能に照らして確認することです。