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**Features and Improvements**
- First Release
- Provide a simple base in-memory cache, Dynamodb-backed cache and multi-layer cache. Users can implement their own serializer to meet their requirements.
- Additional built-in cache backend provided.
- ``InMemoryBackend``
- ``JsonDictInMemoryCache``
- ``JsonListInMemoryCache``
- ``DynamodbBackend``
- ``JsonDictDynamodbCache``
- ``JsonListDynamodbCache``
- ``MultiLayerCache``
- ``JsonDictMultiLayerCache``
- ``JsonListMultiLayerCache``