feat: Add LangGraph integration #3162

Job	Run time
Gevent (pinned) (3.8, ubuntu-22.04)	6m 20s
Gevent (pinned) (3.10, ubuntu-22.04)	6m 45s
Gevent (pinned) (3.12, ubuntu-22.04)	7m 35s
Gevent (pinned) (3.6, ubuntu-22.04)	3m 52s
Gevent (pinned) (3.11, ubuntu-22.04)	6m 25s
All pinned Gevent tests passed	8s
	31m 5s

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