Checkpointer integrations

Checkpointers enable persistence in LangGraph, allowing agents to save and resume state across interactions.

Backend	Package	Source
In-memory	`langgraph-checkpoint`	langchain-ai/langgraph
SQLite	`langgraph-checkpoint-sqlite`	langchain-ai/langgraph
PostgreSQL	`langgraph-checkpoint-postgres`	langchain-ai/langgraph
AWS (DynamoDB, Bedrock, Valkey)	`langgraph-checkpoint-aws`	langchain-ai/langchain-aws
MongoDB	`langgraph-checkpoint-mongodb`	langchain-ai/langchain-mongodb
Redis	`langgraph-checkpoint-redis`	redis-developer/langgraph-redis
Cockroach DB	`langchain-cockroachdb`	cockroachdb/langchain-cockroachdb

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