Support for emacs 29's built-in `treesit` library

[rweir]

Hi!

As you probably know, emacs29 includes built in support for tree-sitter grammars with a library called treesit. Unfortunately it's incompatible with the older out-of-tree tree-sitter.el that this package is based on. Are you interested in porting it / would you accept a patch to port it, which would make this package only work on emacs 29+?