Implement transaction support for dynamodb

[jehanzebqayyum]

Expected Behavior

It would be nice to implement transaction support for dynamodb since now the aws sdk supports transaction. So, we can implement Spring PlatformTransactionManager and provide support to annotate service methods to be transactional.

Actual Behavior

No transactions yet

Steps to Reproduce the Problem

None

Specifications

• Spring Data DynamoDB Version:
• Spring Data Version:
• AWS SDK Version:
• Java Version:
• Platform Details:

All those information are logged by org.socialsignin.spring.data.dynamodb.repository.support.DynamoDBRepositoryFactory on INFO level on startup.
Or use java -version and mvn dependency:tree | grep -E 'spring|aws' to provide those version numbers.