Initial Doxygen pass

[m271828]

Description of changes:

Initial pass on Doxygen generated API documentation.

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

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.81%. Comparing base (1ef205e) to head (deac82d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2424      +/-   ##
==========================================
- Coverage   78.82%   78.81%   -0.01%     
==========================================
  Files         621      621              
  Lines      108431   108432       +1     
  Branches    15389    15392       +3     
==========================================
- Hits        85469    85463       -6     
- Misses      22292    22298       +6     
- Partials      670      671       +1     

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