Fix #6085 - Add get_message_thread method to group chat teams

[Whning0513]

Get current message thread from a group chat team

Feature request from maintainer ekzhu: BaseGroupChat needs a public method for retrieving all messages that have occurred so far during a team run. This requires a new GroupChatGetThread RPC event type that is handled by the BaseGroupChatManager.

Filed by: ekzhu (maintainer)

Teams like RoundRobinGroupChat, SelectorGroupChat, and SwarmGroupChat internally manage message history through the BaseGroupChatManager, but there was no public API to retrieve the current message thread. Users who needed to inspect or log the conversation history had no way to access it.

File 1: python/packages/autogen-agentchat/src/autogen_agentchat/teams/_group_chat/_events.py

• Added GroupChatGetThread RPC event class for requesting the current message thread

File 2: python/packages/autogen-agentchat/src/autogen_agentchat/teams/_group_chat/_base_group_chat_manager.py

• Added handler for GroupChatGetThread event in the group chat manager
• Returns the current message history from the session

File 3: python/packages/autogen-agentchat/src/autogen_agentchat/teams/_group_chat/_base_group_chat.py

• Added public get_message_thread() method to BaseGroupChat
• Sends a GroupChatGetThread RPC to the manager and returns the response

Low - The change adds a new capability without modifying any existing methods. All existing team types (RoundRobinGroupChat, SelectorGroupChat, SwarmGroupChat, MagenticOneGroupChat) inherit the new method through BaseGroupChat.

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