Python: Added more examples (#208)

* Small cleanup

* Added Azure and Foundry chat client samples

* Added Azure chat client agent example

python/samples/getting_started/agents/foundry/foundry_basic.py

@@ -6,7 +6,6 @@ from typing import Annotated
 
 from agent_framework import ChatClientAgent
 from agent_framework.foundry import FoundryChatClient
-from dotenv import load_dotenv
 from pydantic import Field
 
 
@@ -33,5 +32,4 @@ async def main() -> None:
 
 
 if __name__ == "__main__":
-    load_dotenv()
     asyncio.run(main())