Add support for partial batch response for SQS as an event source

[mauroservienti]

As of today, the NServiceBus AWS Lambda package manually deletes successfully processed messages from the input queue. If the incoming batch contains 100 messages and all succeed, one hundred delete message requests will be issued to SQS.

With batch failure reporting, the transport could optimize and report back to SQS which message IDs failed to process in one single roundtrip. In the above scenario of all messages succeeding there is no need to delete any message from the input queue because by simply reporting the successful batch processing the entire batch will be removed from the input queue.