macOS dispatch queue and secitem

[sbSteveK]

Use SecItem and dispatch queue on macOS.

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

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.78%. Comparing base (9cf142c) to head (d86880e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #758      +/-   ##
==========================================
+ Coverage   78.76%   78.78%   +0.01%     
==========================================
  Files          30       30              
  Lines        6410     6410              
==========================================
+ Hits         5049     5050       +1     
+ Misses       1361     1360       -1     

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