consecutive auto reply, history, template, group chat, class-specific reply

[sonichi]

Why are these changes needed?

• reset the counter of consecutive_auto_reply in initiate_chat
• allow separate max_consecutive_auto_reply for different senders
• option to clear conversation history in initiate_chat
• chess notebook using these features
• disallow format str template by default
• print instantiated message
• skeleton of groupchat
• support register class-specific reply function
• group chat notebook

Related issue number

close #1164

Checks

• I've included any doc changes needed for https://microsoft.github.io/FLAML/. See https://microsoft.github.io/FLAML/docs/Contribute#documentation to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

[thinkall]

LGTM with one suggestion.