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.

首先检查 vim-rescript 仓库中的当前高亮语法，以及所引用的 Elm tree-sitter 和 nvim-treesitter 方法。完成的标准是记录或实现一条可行的 Neovim Tree-sitter 支持路径，并解决报告的高亮限制，同时根据所请求的 Neovim 功能检查结果。