Configure SQS FIFO queue deduplication and message groups

Steps

1. Create a FIFO queue with a name ending in .fifo and set ContentBasedDeduplication=true or supply MessageDeduplicationId on each send
2. Assign a MessageGroupId on every SendMessage call to define the ordering scope; messages in the same group are delivered in order
3. Use multiple MessageGroupId values to parallelize consumption; each group is processed by at most one consumer at a time
4. Set VisibilityTimeout long enough for your consumer to process and delete a message before it reappears
5. Poll with ReceiveMessage specifying a MaxNumberOfMessages up to 10 and a WaitTimeSeconds of up to 20 for long polling