chore(auth): Create use cases for device management APIs

[mattcreaser]

• PR title and description conform to Pull Request guidelines.

Issue #, if available:

Description of changes:
Moves logic for device management APIs (remember device, forget device, fetch devices) out of RealAWSAuthCognitoPlugin and into use case classes.

How did you test these changes?
Unit tests

Documentation update required?

• No
• Yes (Please include a PR link for the documentation update)

General Checklist

• Added Unit Tests
• Added Integration Tests
• Security oriented best practices and standards are followed (e.g. using input sanitization, principle of least privilege, etc)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

Attention: Patch coverage is 70.58824% with 20 lines in your changes missing coverage. Please review.

Project coverage is 41.92%. Comparing base (7f874ed) to head (11d40c9).
Report is 33 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2979      +/-   ##
==========================================
- Coverage   44.01%   41.92%   -2.09%     
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  Files         926      974      +48     
  Lines       30485    31780    +1295     
  Branches     4351     4729     +378     
==========================================
- Hits        13419    13325      -94     
- Misses      15601    16942    +1341     
- Partials     1465     1513      +48