Use tree-sitter for CST, add more features

[divarvel]

The core idea of the PR is to leverage biscuit’s tree-sitter grammar, since it’s suited for a language server (it’s made for incremental parsing and is fault tolerant).

• the first commit updates dependencies
• the second one introduces tree-sitter and switches to incremental document store updates
• the third one adds support for autocompleting method names
• the fourth one surfaces TS parsing errors in addition to what biscuit-rust returns
• the fifth and sixth commits add autocompletion for more tokens
• the seventh adds support for goto definiton (variables and predicates)
• the eighth adds support for references (goto reference and highlight reference)
• the ninth adds support for renaming variables and predicates

Predicates are identified both by their name and arity.

Note: claude code has been used to deliver those features

TODO

use a proper tree-sitter-biscuit release