macOS SecItem ECC

[sbSteveK]

SecItem ecc support

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

❌ Patch coverage is 66.66667% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.76%. Comparing base (1af325b) to head (f662b9f).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
source/event_loop.c	60.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #767      +/-   ##
==========================================
- Coverage   78.78%   78.76%   -0.02%     
==========================================
  Files          30       30              
  Lines        6406     6410       +4     
==========================================
+ Hits         5047     5049       +2     
- Misses       1359     1361       +2     

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