Load the LSP from workspace in language extension

[chungweileong94]

Check for existing issues

• Completed

Describe the feature

Some extension needs to load the LSP installed in the workspace, if not fallback to the global installed LSP.

For example:
The biome extension needs to be able to load the LSP binary installed in the workspace, if not install and fallback to a global LSP binary.

However, it doesn't seem like we are able to check if an LSP binary exists in the workspace, as things like Path::exists don't really work (probably because of wasm?).

I also tried to use worktree.read_text_file() to see if the node_modules/@biomejs/biome/package.json exists in the workspace, it works sometimes but mostly doesn't work. biomejs/biome-zed#9

If applicable, add mockups / screenshots to help present your vision of the feature

No response

[jansol]

AIUI this is also necessary for Android development where you need a project-specific version of gradle.