feat: Support R1 reasoning text in model create result; enhance API docs #4044

Job	Run time
format	1m 1s
pyright (./packages/autogen-core)	1m 9s
mypy (./packages/autogen-core)	3m 26s
pyright (./packages/autogen-magentic-one)	1m 10s
mypy (./packages/autogen-magentic-one)	1m 29s
pyright (./packages/agbench)	56s
mypy (./packages/agbench)	56s
pyright (./packages/autogen-ext)	1m 16s
check-proto-changes-python	1m 9s
pyright (./packages/autogen-agentchat)	1m 16s
mypy (./packages/autogen-ext)	3m 9s
docs (./packages/autogen-core)	1m 54s
pyright (./packages/magentic-one-cli)	56s
mypy (./packages/autogen-agentchat)	1m 27s
mypy (./packages/magentic-one-cli)	1m 33s
docs-example-check (./packages/autogen-core)	3m 11s
lint	51s
markdown-code-lint	2m 11s
samples-code-check	1m 9s
test (./packages/autogen-core)	1m 0s
test (./packages/autogen-magentic-one)	1m 50s
test (./packages/autogen-ext)	4m 33s
test (./packages/autogen-agentchat)	1m 9s
codecov (./packages/autogen-core)	10s
codecov (./packages/autogen-magentic-one)	12s
codecov (./packages/autogen-ext)	13s
codecov (./packages/autogen-agentchat)	8s
	39m 24s

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