feat(api): AppSyn Client

[jvh-aws]

• PR title and description conform to Pull Request guidelines.

Issue #, if available:

Description of changes:

How did you test these changes?
(Please add a line here how the changes were tested)

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)
• Ensure commit message has the appropriate scope (e.g fix(storage): message, feat(auth): message, chore(all): message)

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

[codecov]

Codecov Report

❌ Patch coverage is 15.00000% with 17 lines in your changes missing coverage. Please review.
✅ Project coverage is 55.88%. Comparing base (d6d9f52) to head (8659c60).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3312      +/-   ##
==========================================
- Coverage   55.91%   55.88%   -0.04%     
==========================================
  Files        1083     1083              
  Lines       31932    31948      +16     
  Branches     4760     4761       +1     
==========================================
- Hits        17854    17853       -1     
- Misses      12222    12239      +17     
  Partials     1856     1856              

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