feat(langgraph-checkpoint-aws): add DynamoDB store

[5enxia]

This PR provides a DynamoDB-backed store implementation for LangGraph, enabling persistent, hierarchical key-value storage with features like TTL, filtering, and batch operations.

issue: #760

[Copilot]

Pull Request Overview

This PR adds a DynamoDB-backed store implementation for LangGraph, providing persistent key-value storage with hierarchical namespaces, TTL support, filtering, and batch operations as an alternative to the existing Valkey store.

Key Changes:

• Implements DynamoDBStore class extending BaseStore with support for CRUD operations, namespaces, TTL, and filtering
• Adds comprehensive unit tests covering initialization, setup, operations, and filtering functionality
• Provides documentation and sample notebook demonstrating usage patterns

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 14 comments.

Show a summary per file

File	Description
libs/langgraph-checkpoint-aws/langgraph_checkpoint_aws/store/dynamodb/base.py	Core DynamoDB store implementation with table management, CRUD operations, batch processing, and TTL support
libs/langgraph-checkpoint-aws/langgraph_checkpoint_aws/store/dynamodb/exceptions.py	Custom exception classes for DynamoDB store error handling
libs/langgraph-checkpoint-aws/langgraph_checkpoint_aws/store/dynamodb/__init__.py	Module initialization exposing DynamoDBStore
libs/langgraph-checkpoint-aws/langgraph_checkpoint_aws/store/__init__.py	Updated store module exports to include DynamoDBStore
libs/langgraph-checkpoint-aws/langgraph_checkpoint_aws/__init__.py	Updated package exports to include DynamoDBStore
libs/langgraph-checkpoint-aws/tests/unit_tests/store/dynamodb/test_dynamodb_store.py	Comprehensive unit tests for DynamoDB store functionality
libs/langgraph-checkpoint-aws/tests/unit_tests/store/dynamodb/__init__.py	Test module initialization
libs/langgraph-checkpoint-aws/docs/dynamodb_store.md	Complete documentation with usage examples, configuration options, and comparisons
samples/memory/dynamodb_store.ipynb	Interactive notebook demonstrating DynamoDB store features and use cases

Comments suppressed due to low confidence (3)

libs/langgraph-checkpoint-aws/langgraph_checkpoint_aws/store/dynamodb/base.py:15

• Import of 'cast' is not used.

from typing import Any, cast

libs/langgraph-checkpoint-aws/langgraph_checkpoint_aws/store/dynamodb/base.py:18

• Import of 'orjson' is not used.

import orjson

libs/langgraph-checkpoint-aws/langgraph_checkpoint_aws/store/dynamodb/base.py:33

• Import of 'ValidationError' is not used.

from .exceptions import DynamoDBConnectionError, TableCreationError, ValidationError

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