Pass context between AssistantAgent for handoffs #3600

Job	Run time
check-proto-changes-python	1m 10s
docs (./packages/autogen-core)	1m 32s
docs-example-check (./packages/autogen-core)	2m 54s
format	59s
lint	59s
markdown-code-lint	2m 51s
mypy (./packages/autogen-core)	2m 38s
pyright (./packages/autogen-core)	59s
mypy (./packages/autogen-magentic-one)	1m 32s
pyright (./packages/autogen-magentic-one)	1m 5s
mypy (./packages/agbench)	1m 6s
pyright (./packages/agbench)	1m 14s
mypy (./packages/autogen-ext)	2m 2s
pyright (./packages/autogen-ext)	59s
mypy (./packages/autogen-agentchat)	1m 24s
pyright (./packages/autogen-agentchat)	1m 6s
samples-code-check	54s
test (./packages/autogen-core)	1m 31s
mypy (./packages/magentic-one-cli)	1m 32s
pyright (./packages/magentic-one-cli)	1m 1s
test (./packages/autogen-magentic-one)	1m 55s
test (./packages/autogen-ext)	24m 40s
test (./packages/autogen-agentchat)	1m 8s
codecov	0s
	57m 11s

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