Overview

@aryairani requested something like this today and it was super quick to hammer out;

Just implements the "Document Symbols" LSP endpoint so you get a scratch-file outline in supported editors.
Clicking the thing brings you there.

Shows definitions, types, abilities, and named watches.

Shows type signatures if the file typechecks, but still works if it just parses.

Implementation notes

Essentially just converts our unison file type into DocumentSymbols output, it was pretty straight-forward.

Test coverage

Nah, it's pretty simple, we should just dogfood it.

Loose ends

Future improvements:

• Would be nice to fall-back to a previous typecheck/parse if the file is currently not parsing.
• Would be nice to add a special icon for test watches