feat(sqs): ability for the `SQS` to read config from the `IAM`

[rustatian]

Reason for This PR

closes: #142

Description of Changes

• Use credentials provided by the IAM if running inside the AWS.

License Acceptance

By submitting this pull request, I confirm that my contribution is made under the terms of the MIT license.

PR Checklist

[Author TODO: Meet these criteria.] [Reviewer TODO: Verify that these criteria are met. Request changes if not]

• [x] All commits in this PR are signed (git commit -s).
• [x] The reason for this PR is clearly provided (issue no. or explanation).
• [x] The description of changes is clear and encompassing.
• [x] Any required documentation changes (code and docs) are included in this PR.
• [x] Any user-facing changes are mentioned in CHANGELOG.md.
• [x] All added/changed functionality is tested.

[codecov[bot]]

Codecov Report

Merging #197 (67deac1) into master (3797301) will decrease coverage by 0.17%. The diff coverage is 53.93%.

@@            Coverage Diff             @@
##           master     #197      +/-   ##
==========================================
- Coverage   68.42%   68.24%   -0.18%     
==========================================
  Files         141      141              
  Lines       10767    10808      +41     
==========================================
+ Hits         7367     7376       +9     
- Misses       2631     2659      +28     
- Partials      769      773       +4     

Impacted Files	Coverage Δ
sqs/sqsjobs/listener.go	61.70% <0.00%> (ø)
sqs/sqsjobs/consumer.go	68.91% <54.54%> (-5.26%)	:arrow_down:
sqs/sqsjobs/config.go	84.21% <0.00%> (-15.79%)	:arrow_down:
sqs/sqsjobs/item.go	65.78% <0.00%> (-1.32%)	:arrow_down:

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