Evaluate `JupyterServerConnectionInformation` proposed API that should make it unnecessary to create a fake jupyter server

[gjsjohnmurray]

wanted to reach out to you about a proposed API that will make it unnecessary to create a fake jupyter server.
Today I can see that you have a fake server that handles http requests and the like,
Its possible (via a proposed API) to contribute a jupyter server that doesn't listen to any HTTP endpoints.
I.e. you can intercept all of the messages (http calls are made using a fetch implementation that can be provided by 3rd party and similarly websocket class implementation too can be provided by 3rd party, which means http requests completely unecessary.

Let me know if this is something you'd like to implement and I can led a hand.
Here's the proposed API that makes all of this possible https://github.com/microsoft/vscode-jupyter/blob/main/src/api.proposed.jupyterSettings.d.ts

Originally posted by @DonJayamanne in #6 (comment)