Python: Persist user and assistant messages in chat history (concept sample) (#7407)

### Motivation and Context

In the concept sample `chat_gpt_api_function_calling.py`, the user
messages and assistant messages are not persisted in the history as the
user continues to chat.

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### Description

This PR persists the user and assistant messages in the history for the
sample. Supersedes #6668 as there were errors with the pre-commit check.

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### Contribution Checklist

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- [X] The code builds clean without any errors or warnings
- [X] The PR follows the [SK Contribution
Guidelines](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md)
and the [pre-submission formatting
script](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md#development-scripts)
raises no violations
- [X] All unit tests pass, and I have added new tests where possible
- [X] I didn't break anyone 😄

python/samples/concepts/auto_function_calling/chat_gpt_api_function_calling.py

@@ -120,7 +120,7 @@ async def handle_streaming(
     kernel: Kernel,
     chat_function: "KernelFunction",
     arguments: KernelArguments,
-) -> None:
+) -> str | None:
     response = kernel.invoke_stream(
         chat_function,
         return_function_results=False,
@@ -129,12 +129,14 @@ async def handle_streaming(
 
     print("Mosscap:> ", end="")
     streamed_chunks: list[StreamingChatMessageContent] = []
+    result_content = []
     async for message in response:
         if not execution_settings.function_choice_behavior.auto_invoke_kernel_functions and isinstance(
             message[0], StreamingChatMessageContent
         ):
             streamed_chunks.append(message[0])
         else:
+            result_content.append(message[0])
             print(str(message[0]), end="")
 
     if streamed_chunks:
@@ -145,6 +147,9 @@ async def handle_streaming(
         print_tool_calls(streaming_chat_message)
 
     print("\n")
+    if result_content:
+        return "".join([str(content) for content in result_content])
+    return None
 
 
 async def chat() -> bool:
@@ -164,7 +169,7 @@ async def chat() -> bool:
     arguments["chat_history"] = history
 
     if stream:
-        await handle_streaming(kernel, chat_function, arguments=arguments)
+        result = await handle_streaming(kernel, chat_function, arguments=arguments)
     else:
         result = await kernel.invoke(chat_function, arguments=arguments)
 
@@ -177,6 +182,9 @@ async def chat() -> bool:
             return True
 
         print(f"Mosscap:> {result}")
+
+    history.add_user_message(user_input)
+    history.add_assistant_message(str(result))
     return True