Python: orchestration workflows should send request info event when receiving user input request content from agent or model.

[ekzhu]

Orchestration patterns such as sequential, concurrent, and magentic should emits a RequestInfoEvent and returns when agent produces user input request content such as FunctionApprovalUserInputRequest. The response should be routed back to the original agent produced the request.

[moonbox3]

This should now be handled as of #2022