Add module level docstrings #2327

Job	Run time
format	49s
mypy (./packages/autogen-core)	1m 59s
lint	50s
pyright (./packages/autogen-core)	54s
mypy (./packages/autogen-magentic-one)	1m 10s
pyright (./packages/autogen-magentic-one)	1m 4s
mypy (./packages/agbench)	55s
pyright (./packages/agbench)	52s
mypy (./packages/autogen-ext)	1m 41s
pyright (./packages/autogen-ext)	1m 2s
mypy (./packages/autogen-agentchat)	1m 7s
pyright (./packages/autogen-agentchat)	1m 9s
docs (./packages/autogen-core)	1m 24s
docs-example-check (./packages/autogen-core)	2m 33s
test (./packages/autogen-core)	52s
test (./packages/autogen-magentic-one)	1m 29s
check-proto-changes-python	1m 16s
test (./packages/autogen-ext)	2m 33s
test (./packages/autogen-agentchat)	59s
	24m 38s

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