Grand dispatch queue

[sbSteveK]

Integration of Apple's grand dispatch queue with event loop

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

Attention: Patch coverage is 73.91304% with 6 lines in your changes missing coverage. Please review.

Project coverage is 80.29%. Comparing base (c345d77) to head (5ab8f24).

Files with missing lines	Patch %	Lines
source/event_loop.c	72.72%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #661      +/-   ##
==========================================
- Coverage   80.39%   80.29%   -0.10%     
==========================================
  Files          28       28              
  Lines        5992     6013      +21     
==========================================
+ Hits         4817     4828      +11     
- Misses       1175     1185      +10     

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