Python: [BREAKING] added SerializationMixin and applied to contents, agents, chat client… (#1012)

* added SerializationMixin and applied to contents, agents, chat clients, removed AFBaseModel

* fix annotations type

* mypy fixes

* fix tests

* fix serializable subvalues and added large docstring

* updated indents in code block

* fixed exported urls

python/packages/devui/samples/in_memory_mode.py

@@ -46,7 +46,7 @@ def main():
             "You are a helpful weather and time assistant. Use the available tools to "
             "provide accurate weather information and current time for any location."
         ),
-        chat_client=OpenAIChatClient(ai_model_id="gpt-4o-mini"),
+        chat_client=OpenAIChatClient(model_id="gpt-4o-mini"),
         tools=[get_weather, get_time],
     )
 
@@ -54,7 +54,7 @@ def main():
         name="general-assistant",
         description="A simple conversational agent",
         instructions="You are a helpful assistant.",
-        chat_client=OpenAIChatClient(ai_model_id="gpt-4o-mini"),
+        chat_client=OpenAIChatClient(model_id="gpt-4o-mini"),
     )
 
     # Collect entities for serving

python/packages/devui/samples/weather_agent/agent.py

@@ -42,7 +42,7 @@ agent = ChatAgent(
     and forecasts for any location. Always be helpful and provide detailed
     weather information when asked.
     """,
-    chat_client=OpenAIChatClient(ai_model_id=os.environ.get("OPENAI_CHAT_MODEL_ID", "gpt-4o")),
+    chat_client=OpenAIChatClient(model_id=os.environ.get("OPENAI_CHAT_MODEL_ID", "gpt-4o")),
     tools=[get_weather, get_forecast],
 )