Enable dumping SelectorGroupChat selector_func and candidate_func

[HodeiG]

Hi team,

I've noticed that in SelectorGroupChat, the selector_func and candidate_func are not being serialized when calling team.dump_component().

Looking at the source code, it appears that dumping of selector_func is explicitly disabled, and there is currently no logic implemented to dump candidate_func:

autogen/python/packages/autogen-agentchat/src/autogen_agentchat/teams/_group_chat/_selector_group_chat.py

Line 560 in 8efa1f1

# selector_func=self._selector_func.dump_component() if self._selector_func else None,

Would it be possible to consider enabling serialization of these functions in a future update? This would be very helpful for saving and restoring full team configurations, especially when using custom logic for role selection.

Thanks for the great work on this project!