Feature/message attributes

[joe666]

This exposes the MessageAttributes which are different than the message Attributes when receiving messages

https://docs.aws.amazon.com/AWSSimpleQueueService/latest/APIReference/API_Message.html

[codecov]

Codecov Report

Merging #46 (437e642) into master (89c7ffc) will decrease coverage by 4.03%.
The diff coverage is 71.42%.

@@             Coverage Diff              @@
##             master      #46      +/-   ##
============================================
- Coverage     94.39%   90.35%   -4.04%     
- Complexity      139      141       +2     
============================================
  Files            18       18              
  Lines           553      560       +7     
============================================
- Hits            522      506      -16     
- Misses           31       54      +23     

Impacted Files	Coverage Δ	Complexity Δ
Service/Message.php	65.85% <66.66%> (-34.15%)	15.00 <2.00> (+2.00)	⬇️
Service/BaseQueue.php	90.80% <100.00%> (-9.20%)	26.00 <0.00> (ø)
DependencyInjection/Configuration.php	97.67% <0.00%> (-2.33%)	6.00% <0.00%> (ø%)

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