[DynamoDB online store] Disable entity key serialization and allow the entity_id to be configurable

Hi,

we have DynamoDb online store and we are using DynamoDBOnlineStoreConfig, where we want to get online features from, but the problem is that it does not allows the custom primary keys to be used, and it always uses the entity_id as the key and also hashes the value as well. Is there a way to change this behavior?