[SQS] [Fix] Implements full support for 1MB SQS message size

[henryivesjones]

There is a bug in the current SQS send_message implementation that doesn't allow messages > 256KB to be sent. That limitation has been raised to 1MiB in AWS. This fix correctly sets a given queues max message size to the value set when creating the queue.

At present there are two separate places that the maximum size for an sqs message is defined. One of them contains the old value of 256KB. This value is used in a pre-check within the send_message method.

        if len(message) > MAXIMUM_MESSAGE_LENGTH:
            raise SQSException(
                "InvalidParameterValue",
                "One or more parameters are invalid. Reason: Message must be shorter than 262144 bytes.",
            )

My change consolidate that size max to a single definition and removes this pre-check. There is another check on the sqs_backend that enforces the actual size limit for the given queue. The queue model has protections on the attribute being set as well as a default value so I believe that this extra check is unnecessary.

I added a test case that would have caught this bug as well as fixed a test that referenced the 256KB limit.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.08%. Comparing base (47f5323) to head (ebb5dc7).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #9682   +/-   ##
=======================================
  Coverage   93.08%   93.08%           
=======================================
  Files        1302     1302           
  Lines      118298   118295    -3     
=======================================
- Hits       110114   110113    -1     
+ Misses       8184     8182    -2     

Flag	Coverage Δ
servertests	28.92% <100.00%> (-0.01%)	⬇️
unittests	93.05% <100.00%> (+<0.01%)	⬆️

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[bpandola]

Thanks @henryivesjones