Start testing out tree-sitter commands

[haberdashPI]

Check out: https://github.com/71/vscode-tree-sitter-api

• get compiled and installed
• create some new commands to make it possible to drive the API from keybindings
• generate a grammar for julia

[haberdashPI]

This idea needs to be abandoned for now. Using the tree-sitter-api for vscode seems to be non-trivial from a web extension.

Alternative: I could move selection-utilities to a desktop extension (or dual? would that work?), and see if I can get it working in that context.

[haberdashPI]

Alternative, temporary approach: create a separate syntactic-selection extension that is desktop based, and use that for now.

[haberdashPI]

For now, given the state of the vscode tree sitter API, and the limited implement of tree-sitter grammars for my most common use case (Julia) has lead me to de-prioritize this for the time being.