FIFO Queue/Topic Support

[nohagan-gs]

This PR makes the following changes:

• Supports the use of MessageGroupId & MessageDeduplicationId on message publishing (via PublishMetadata)
• Supports the use of FIFO Topics & Queues
  • Support added to the non-addressed subscription/publication builders (WithFifo)
• Additional Integration tests for FIFO Topics/Queues

Per discussion in #911 there was openness to FIFO support being contributed

Notes/Questions :

• When using WithFifo there is an expectation on the configuration to use the ".fifo" suffix on Queue/Topic names - do we want to force the client knowledge of this, or hide it away and auto-add it?
  • Easy enough to do on the Queue/Topic creation, slightly more complexity to propagate it through to the queue -> handler mappings
• Does not support Content-based deduplication at this time, only based on MessageDeduplicationId
• Relies on the SNS/SQS Validation that publishing to a FIFO resource requires the MessageGroupId, better to validate pre-publish?
• The method of specifying the MessageGroupId/MessageDeduplicationId on the PublishBatchMetadata feels clunky, better alternatives?