LangGraph AWS Checkpoint

The `langgraph-checkpoint-aws` library provides a LangGraph checkpointer implementation that leverages AWS Bedrock Session Management Service (SMS) for session storage and AWS ElastiCache Valkey (Redis) for state management. It enables stateful and resumable LangGraph agents, allowing them to persist and retrieve their execution state across invocations. The current version is 1.0.7, and its release cadence is tied to the LangChain ecosystem, implying active development and frequent updates.