Python and dotnet agents interoperability sample

This sample demonstrates how to create a Python agent that interacts with a .NET agent. To run the sample, check out the autogen repository. Then do the following: 1. Navigate to autogen/dotnet/samples/Hello/Hello.AppHost 2. Run dotnet run to start the .NET Aspire app host, which runs three projects: - Backend (the .NET Agent Runtime) - HelloAgent (the .NET Agent) - this Python agent - hello_python_agent.py 3. The AppHost will start the Aspire dashboard on https://localhost:15887. The Python agent will interact with the .NET agent by sending a message to the .NET runtime, which will relay the message to the .NET agent.