Adding callable summary_method support and enhancements to initiate_chats (#1628)

* initiate_chats enhancements

* callable summary_method

* summary method

* summary method default

* docstr

* add timeout to slient pip install test

* consolidate_chat_info

* a_initiate_chat

* AssertionError test

* update tests

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Co-authored-by: Eric Zhu <ekzhu@users.noreply.github.com>