[WIP] Implement LSP

[cardoso]

Closes #3

Super WIP, but thought it might be good to have some initial feedback on the approach.

For now, https://github.com/bytecodealliance/wasm-tools is used, but I'm thinking about adding support for https://github.com/bytecodealliance/cargo-component since currently it has its own logic for resolving wit packages, which seems to have some advantages.

To test it out, have a recent version of wasm-tools installed, run npm install, npm start & reload the vscode window.

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TODO

• [ ] lint correctly when inside deps folder
• [ ] allow configuring problem matcher & pattern
• [ ] run wit-deps when appropriate
• [ ] clean up package.json scripts
• [ ] clean up changes as much as possible

[cardoso]

Thanks @eduardomourar - I'll get started on the tests

Some updates: Ultimately I decided to fork wit-parser so I could make some items public for more advanced features than linting such as semantic tokens, contextual hovering, etc.

This code would more appropriately live in the wasm-tools repository alongside wit-parser.

My current thinking is for this to become a binary crate "wit-lsp" in wasm-tools with some of the logic pushed to the wit-parser crate under an "lsp" feature flag.

This isn't blocking as I can keep using the fork for now, but I think moving to that approach would make the LSP more robust and easier to keep up-to-date. Also, keeping it separate from the VSCode extension would make it easier to port for other editors.

I can make that move if it makes sense.

[eduardomourar]

@cardoso , let's keep the LSP code here for now in order to iterate more quickly (specially because I don't have permissions to the wasm-tools repository). To simplify that migration later on, we need to move all LSP related files to a folder called ./lsp.

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