Investigate integrating LSP with jupyterlite deployment

### Problem

LSP completions and linting is available on Binder preview but not on JupyterLite deployments.

### Proposed Solution

In principle we should be able to run a typescript language server in a webworker without requiring the jupyter-lsp server extension:
- Plumbing - we need to either:
- mock some of the LSP jupyter-lsp server endpoints **or**
- swap the plugin responsible for taking with the backen
- Server - we need either:
- check what is required to run typescript language server in browser (do we need any node js mocks) ideally in a webworker
- use a relevant language server if one was compiled to wasm already

### Additional context

Some earlier exploration https://github.com/jupyter-lsp/jupyterlab-lsp/issues/184