Update AGS to Use AgentChat Declarative Config Serialization #4069

Job	Run time
lint	55s
format	1m 3s
check-proto-changes-python	1m 28s
docs (./packages/autogen-core)	1m 41s
docs-example-check (./packages/autogen-core)	3m 22s
markdown-code-lint	2m 27s
mypy (./packages/autogen-core)	3m 21s
pyright (./packages/autogen-core)	1m 22s
mypy (./packages/autogen-magentic-one)	1m 29s
pyright (./packages/autogen-magentic-one)	1m 6s
mypy (./packages/agbench)	1m 8s
pyright (./packages/agbench)	1m 3s
samples-code-check	1m 5s
mypy (./packages/autogen-ext)	2m 59s
pyright (./packages/autogen-ext)	1m 6s
mypy (./packages/autogen-agentchat)	1m 34s
pyright (./packages/autogen-agentchat)	1m 4s
mypy (./packages/magentic-one-cli)	1m 24s
pyright (./packages/magentic-one-cli)	1m 0s
test (./packages/autogen-core)	1m 3s
test (./packages/autogen-magentic-one)	2m 5s
test (./packages/autogen-ext)	4m 17s
test (./packages/autogen-agentchat)	1m 18s
codecov (./packages/autogen-core)	8s
codecov (./packages/autogen-magentic-one)	10s
codecov (./packages/autogen-ext)	13s
codecov (./packages/autogen-agentchat)	10s
	40m 1s

Provide feedback