feat(lsp): simple diagnostics

[Natoandro]

Describe your change

Adds a simple LSP implementation for diagnostics.

Motivation and context

Better DX, catch potential errors while editing the typegraph module.

Migration notes

Checklist

• The change come with new or modified tests
• Hard-to-understand functions have explanatory comments
• End-user documentation is updated to reflect the change

[Yohe-Am]

@Natoandro I think what's happening here is that the dev/lock.ts script is touching some Cargo.toml files from the tree sitter packages pulled in by pnpm. Looking at the rules in dev/lock.yml for Cargo.toml files, those shouldn't really qualify so I'm not sure what's going on.

[Yohe-Am]

Ah, so it doesn't let the original author approve a PR even though a separate author pushed the most recent changes.