Python: Fix broken samples and add missing READMEs (#5038)

* Python: Fix broken samples and add missing READMEs

- simple_context_provider: move instructions kwarg into options dict
- suspend_resume_session: use OpenAIChatCompletionClient for in-memory demo
- foundry_chat_client_with_hosted_mcp: move store kwarg into options dict
- Add README.md for context_providers and conversations sample folders

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Python: Fix additional sample issues in context_providers

- mem0_basic: send preferences query before sleep so Mem0 can learn them,
  print result from new session recall
- mem0_sessions: add session for multi-turn conversation in agent-scoped
  example, remove user_id from agent-scoped provider (Mem0 API stores
  memories without user_id when agent_id is provided), use single message
  for storing preferences
- redis_basics: print retrieved context messages instead of raw object
- redis_sessions: add missing load_dotenv() call
- redis_basics/redis_sessions: fix docstrings referencing wrong client type
- azure_redis_conversation: replace duplicate copyright with load_dotenv()

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Python: Fix broken link in declarative README

openai_responses_agent.py was renamed to openai_agent.py

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

python/samples/02-agents/context_providers/simple_context_provider.py

@@ -50,9 +50,11 @@ class UserInfoMemory(ContextProvider):
                 # Use the chat client to extract structured information
                 result = await self._chat_client.get_response(
                     messages=request_messages,  # type: ignore
-                    instructions="Extract the user's name and age from the message if present. "
-                    "If not present return nulls.",
-                    options={"response_format": UserInfo},
+                    options={
+                        "instructions": "Extract the user's name and age from the message if present. "
+                        "If not present return nulls.",
+                        "response_format": UserInfo,
+                    },
                 )
 
                 # Update user info with extracted data