Prototype communication between custom Python REPL and Node

[anthonykim1]

In order for custom REPL and Python extension's notebook controller can communicate, we need to build way of communication leveraging VS Code's https://www.npmjs.com/package/vscode-jsonrpc and jsonrpc-async, jsonrpc-websockets.

Using https://www.npmjs.com/package/@vscode/python-extension, we should first create separate prototype extension to make sure communication happens smoothly between TypeScript side and Python side that has the custom REPL before embeding code into VS Code Python repo's notebook controller: #23100

[karthiknadig]

Closing this as this is done, it is not testable yet.