Add missing py.typed in autogen_ext, fix type issue in core (#4993) #3330

Job	Run time
format	47s
lint	52s
codecov (./packages/autogen-core)	56s
docs (./packages/autogen-core)	1m 34s
codecov (./packages/autogen-magentic-one)	1m 46s
docs-example-check (./packages/autogen-core)	2m 32s
mypy (./packages/autogen-core)	2m 9s
codecov (./packages/autogen-ext)	2m 35s
mypy (./packages/autogen-magentic-one)	1m 8s
mypy (./packages/agbench)	53s
codecov (./packages/autogen-agentchat)	1m 3s
pyright (./packages/autogen-core)	1m 4s
mypy (./packages/autogen-ext)	1m 54s
test (./packages/autogen-core)	52s
pyright (./packages/autogen-magentic-one)	2m 51s
mypy (./packages/autogen-agentchat)	1m 10s
test (./packages/autogen-magentic-one)	1m 19s
pyright (./packages/agbench)	53s
mypy (./packages/magentic-one-cli)	1m 29s
test (./packages/autogen-ext)	2m 45s
pyright (./packages/autogen-ext)	1m 0s
test (./packages/autogen-agentchat)	1m 0s
pyright (./packages/autogen-agentchat)	1m 4s
pyright (./packages/magentic-one-cli)	1m 23s
check-proto-changes-python	1m 16s
markdown-code-lint	2m 5s
samples-code-check	1m 3s
	39m 23s

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