Log error code and message for each BatchResultErrorEntry

[Glen-Moonpig]

Intended to solve #22

I do not code in go, so the code may need some work. Please advise.

[Glen-Moonpig]

Tested working:

./sqsmover --source=my-source-queue --destination=my-destination-queue --region="eu-west-1"

   • Source queue URL: https://sqs.eu-west-1.amazonaws.com/123456789/my-source-queue
   • Destination queue URL: https://sqs.eu-west-1.amazonaws.com/123456789/my-destination-queue
   • Approximate number of messages in the source queue: 1688
   • Starting to move messages...

   ⨯ 10 messages failed to enqueue, see details below
   ⨯ 0 - (InvalidParameterValue) One or more parameters cannot be validated. Reason: Message must be shorter than 2048 bytes.
   ⨯ 1 - (InvalidParameterValue) One or more parameters cannot be validated. Reason: Message must be shorter than 2048 bytes.
   ⨯ 2 - (InvalidParameterValue) One or more parameters cannot be validated. Reason: Message must be shorter than 2048 bytes.
   ⨯ 3 - (InvalidParameterValue) One or more parameters cannot be validated. Reason: Message must be shorter than 2048 bytes.
   ⨯ 4 - (InvalidParameterValue) One or more parameters cannot be validated. Reason: Message must be shorter than 2048 bytes.
   ⨯ 5 - (InvalidParameterValue) One or more parameters cannot be validated. Reason: Message must be shorter than 2048 bytes.
   ⨯ 6 - (InvalidParameterValue) One or more parameters cannot be validated. Reason: Message must be shorter than 2048 bytes.
   ⨯ 7 - (InvalidParameterValue) One or more parameters cannot be validated. Reason: Message must be shorter than 2048 bytes.
   ⨯ 8 - (InvalidParameterValue) One or more parameters cannot be validated. Reason: Message must be shorter than 2048 bytes.
   ⨯ 9 - (InvalidParameterValue) One or more parameters cannot be validated. Reason: Message must be shorter than 2048 bytes.

[mercury2269]

Looks great, thanks a lot @Glen-Moonpig!