Resolve types issues in coding (#2055)

* Improve conversable agent interface, fix some typing

* formatting

* import

* rearrange to fix circular import

* type fixes

* undo system message change

* add coding to check, lint

* Update conversable_agent.py

* Apply suggestions from code review

Co-authored-by: Davor Runje <davor@airt.ai>

* put back # type: ignore

* formatting

* revert conversable agent

* ci fix

* Update type-check.yml

* fix double install, and redudant args, address type ignores

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Co-authored-by: Davor Runje <davor@airt.ai>
Co-authored-by: Chi Wang <wang.chi@microsoft.com>