* Added a GroupChatRepresentative class that uses group chat as an inner-monologue.
* Renamed GroupChatRepresentative to SocietyOfMindAgent
* Added tests for the society of mind agent.
* Don't force message attribution -- the defaults are correct.
* Add names to external messages.
* Added some comments to document code, per request.
* Added some comments to document code, per request.
* Added a Notebook example, and the ability to use a prompt as the response_preparer.
* Protect inner chat with try-catch
* Fixed typo.
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Co-authored-by: Chi Wang <wang.chi@microsoft.com>