Make FileSurfer support component config serialization

[balakreshnan]

What happened?

MagenticOneGroupChat with

file_surfer = FileSurfer(
    name="file_surfer",
    model_client=model_client,
    description="Please scan the current folder ./data and preview the file contents.",
    #handoffs=["success_agent"],  # Handoff to the assistant agent after file selection
)

team = MagenticOneGroupChat([file_surfer], 
                            termination_condition=termination, 
                            max_turns=1,
                            model_client=model_client)

c:\Code\autogenstudio\autogenstudiocode.venv\Lib\site-packages\autogen_agentchat\teams_group_chat_magentic_one_magentic_one_group_chat.py:139: UserWarning: Internal module name used in provider string. This is not recommended and may cause issues in the future. Silence this warning by setting component_provider_override to this value.
participants = [participant.dump_component() for participant in self._participants]
Traceback (most recent call last):
File "C:\Code\autogenstudio\autogenstudiocode\magenticfile.py", line 313, in
serialized = team.dump_component().model_dump(mode='python')
~~~~~~~~~~~~~~~~~~~^^
File "c:\Code\autogenstudio\autogenstudiocode.venv\Lib\site-packages\autogen_core_component_config.py", line 150, in dump_component
obj_config = self._to_config().model_dump(exclude_none=True)
~~~~~~~~~~~~~~~^^
File "c:\Code\autogenstudio\autogenstudiocode.venv\Lib\site-packages\autogen_agentchat\teams_group_chat_magentic_one_magentic_one_group_chat.py", line 139, in _to_config
participants = [participant.dump_component() for participant in self._participants]
~~~~~~~~~~~~~~~~~~~~~~~~~~^^
File "c:\Code\autogenstudio\autogenstudiocode.venv\Lib\site-packages\autogen_core_component_config.py", line 150, in dump_component
obj_config = self._to_config().model_dump(exclude_none=True)
~~~~~~~~~~~~~~~^^
File "c:\Code\autogenstudio\autogenstudiocode.venv\Lib\site-packages\autogen_core_component_config.py", line 114, in _to_config
raise NotImplementedError("This component does not support dumping to config")
NotImplementedError: This component does not support dumping to config
C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.13_3.13.752.0_x64__qbz5n2kfra8p0\Lib\asyncio\proactor_events.py:116: ResourceWarning: unclosed transport <_ProactorSocketTransport fd=868 read=<_OverlappedFuture cancelled>>

What did you expect to happen?

https://github.com/balakreshnan/Samples2025/blob/main/autogen/autogenmagenticfilesurfer.md

How can we reproduce it (as minimally and precisely as possible)?

https://github.com/balakreshnan/Samples2025/blob/main/autogen/autogenmagenticfilesurfer.md

AutoGen version

0.4.7

Which package was this bug in

Core

Model used

No response

Python version

3.13

Operating system

No response

Any additional info you think would be helpful for fixing this bug

No response