feat: implement subscriber

[x4b1]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 74.30556% with 37 lines in your changes are missing coverage. Please review.

Project coverage is 58.86%. Comparing base (96f9832) to head (3b62ada).

Files	Patch %	Lines
example/abitofall/main.go	0.00%	15 Missing ⚠️
broker/sqs/subscriber.go	82.19%	12 Missing and 1 partial ⚠️
broker/sqs/publisher.go	64.28%	5 Missing ⚠️
store/postgres/store.go	50.00%	0 Missing and 3 partials ⚠️
internal/testhelpers/aws.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #127       +/-   ##
===========================================
- Coverage   88.30%   58.86%   -29.44%     
===========================================
  Files           9       20       +11     
  Lines         402      761      +359     
===========================================
+ Hits          355      448       +93     
- Misses         32      295      +263     
- Partials       15       18        +3     

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