Make grpc an optional dependency (#4315) #1551

Job	Run time
format	30s
lint	22s
mypy (./packages/autogen-core)	1m 28s
pyright (./packages/autogen-core)	27s
pyright (./packages/autogen-magentic-one)	40s
mypy (./packages/autogen-magentic-one)	41s
check-proto-changes-python	50s
pyright (./packages/agbench)	28s
docs (./packages/autogen-core)	56s
pyright (./packages/autogen-ext)	26s
mypy (./packages/agbench)	25s
pyright (./packages/autogen-agentchat)	22s
test (./packages/autogen-core)	51s
mypy (./packages/autogen-ext)	52s
test (./packages/autogen-magentic-one)	55s
mypy (./packages/autogen-agentchat)	35s
test (./packages/autogen-ext)	1m 13s
test (./packages/autogen-agentchat)	35s
	12m 36s

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