ltreesitter-ts

This combines [ltreesitter](https://github.com/EuclidianAce/ltreesitter) and the [tree-sitter](https://github.com/tree-sitter/tree-sitter) library together to have an easy LuaRocks based install for tree sitter parsing. There are no other enhancements to either library. It can be imported as just `ltreesitter`.