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1. Add `on_pause` and `on_resume` API to `ChatAgent` to support pausing behavior when running `on_message` concurrently. 2. Add `GroupChatPause` and `GroupChatResume` RPC events and handle them in `ChatAgentContainer`. 3. Add `pause` and `resume` API to `BaseGroupChat` to allow for this behavior accessible from the public API. 4. Improve `SequentialRoutedAgent` class to customize which message types are sequentially handled, making it possible to have concurrent handling for some messages (e.g., `GroupChatPause`). 5. Added unit tests. See `test_group_chat_pause_resume.py` for how to use this feature. What is the difference between pause/resume vs. termination and restart? - Pause and resume issue direct RPC calls to the participanting agents of a team while they are running, allowing putting the on-going generation or actions on hold. This is useful when an agent's turn takes a long time and multiple steps to complete, and user/application wants to re-evaluate whether it is worth continue the step or cancel. This also allows user/application to pause individual agents and resuming them independently from the team API. - Termination and restart requires the whole team to comes to a full-stop, and termination conditions are checked in between agents' turns. So termination can only happen when no agent is working on its turn. It is possible that a termination condition has reached well before the team is terminated, if the agent is taking a long time to generate a response. Resolves: #5881