Export grammar and highlighting consts in Rust bindings

[JosiahParry]

All tree-sitter rust bindings I've encountered provide consts with the grammar, highlighting rules, etc to be able to be used with tree-sitter-highlight. For example tree-sitter-javascript. However, these are not provided in tree-sitter-r.

Could they be included in the next crates.io release?

I will note that I did try including the files grammar.js and the scm files but the highlights.scm file caused a panic with tree-sitter—perhaps the syntax rules changed?