Pass context between AssistantAgent for handoffs #3605

Job	Run time
format	59s
docs (./packages/autogen-core)	1m 31s
docs-example-check (./packages/autogen-core)	2m 41s
lint	46s
mypy (./packages/autogen-core)	2m 31s
pyright (./packages/autogen-core)	56s
mypy (./packages/autogen-magentic-one)	1m 27s
pyright (./packages/autogen-magentic-one)	1m 6s
test (./packages/autogen-core)	1m 10s
mypy (./packages/agbench)	57s
test (./packages/autogen-magentic-one)	1m 52s
pyright (./packages/agbench)	52s
mypy (./packages/autogen-ext)	2m 15s
test (./packages/autogen-ext)	4m 0s
pyright (./packages/autogen-ext)	1m 11s
mypy (./packages/autogen-agentchat)	1m 20s
test (./packages/autogen-agentchat)	1m 15s
pyright (./packages/autogen-agentchat)	56s
mypy (./packages/magentic-one-cli)	1m 27s
pyright (./packages/magentic-one-cli)	53s
check-proto-changes-python	1m 27s
markdown-code-lint	2m 4s
samples-code-check	55s
codecov (./packages/autogen-core)	10s
codecov (./packages/autogen-magentic-one)	12s
codecov (./packages/autogen-ext)	10s
codecov (./packages/autogen-agentchat)	9s
	35m 12s

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