Amazon SNS FIFO Support in PutSNS Processor

Please consider an improvement request to add functionality to the PutSNS processor to support the October 2020 release of FIFO messaging in AWS SNS.  This would include the capabilities to have attributes for Message Group ID, Content-Based Deduplication and a Deduplication ID.

This would be similar to NIFI-4540 that was recently resolved for PutSQS FIFO.