Checkpointer integrations

Integrate with checkpointer backends for LangGraph persistence.

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
Azure Cosmos DB NoSQL	langchain-azure-cosmosdb	langchain-ai/langchain-azure
Redis	langgraph-checkpoint-redis	redis-developer/langgraph-redis
Cockroach DB	langchain-cockroachdb	cockroachdb/langchain-cockroachdb
Aerospike	langgraph-checkpoint-aerospike	aerospike-community/aerospike-langgraph

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