Update tree-sitter and make package usable from rust

[caius]

tree-sitter 0.20 generates both NodeJS & Rust bindings, which then makes it usable as a dependency of a rust project.

Updating the node dependency then running ./node_modules/.bin/tree-sitter generate generates the rest of it. Updated the .gitignore to hide the build artefacts for both NodeJS & Rust too.

npm install work as expected, and now cargo build works too.