constexpr updates

[darbyjohnston]

Fixes #1720

Changes:

• Add constexpr to more functions in OpenTime
• Remove redundant inline on constexpr functions
• Move constexpr before the return type on functions

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.95%. Comparing base (82068e3) to head (2f9227b).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1721      +/-   ##
==========================================
- Coverage   79.96%   79.95%   -0.02%     
==========================================
  Files         197      197              
  Lines       21867    21879      +12     
  Branches     4338     4342       +4     
==========================================
+ Hits        17487    17494       +7     
- Misses       2249     2252       +3     
- Partials     2131     2133       +2     

Flag	Coverage Δ
py-unittests	79.95% <100.00%> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
src/opentime/rationalTime.h	93.61% <100.00%> (ø)
src/opentime/timeRange.h	98.18% <ø> (ø)
src/opentime/timeTransform.h	83.33% <100.00%> (ø)

... and 8 files with indirect coverage changes

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[darbyjohnston]

The last build action failed due to a codecov error:

[2024-04-09T16:08:22.025Z] ['error'] There was an error running the uploader: Error uploading to [https://codecov.io:](https://codecov.io/) Error: There was an error fetching the storage URL during POST: 404 - {'detail': ErrorDetail(string='Unable to locate build via Github Actions API. Please upload with the Codecov repository upload token to resolve issue.', code='not_found')}
Error: Codecov: Failed to properly upload: The process '/home/runner/work/_actions/codecov/codecov-action/v3.1.1/dist/codecov' failed with exit code 255

[meshula]

lgtm