[Feature request] Implement LSP 3.17 notebook document support

[zhanba]

Elevator Pitch

LSP 3.17 have supported notebook document, maybe jupyter-lsp can implement it.

Motivation

• By leverage LSP 3.17, the design of jupyterlab-lsp can be simplefied a lot! The VirtualDocument design is not necessary, the client implementation is much easier. Many lint and format problem introduced by VirtualDocument is not exist any more.
• Ruff has recently support notebook(lint & format) by using LSP 3.17.

Design Ideas

[krassowski]

the design of jupyterlab-lsp can be simplefied a lot!

At the cost of not working with majority of language servers, and having more complicated state for each individual cell. This is not straightforward, I looked into it a few times and while supporting this in a future is possibility, the cost/benefit ratio is not clear just yet.