Remove patch version from namespace

[darbyjohnston]

Fixes #1978

This PR removes the patch version from the OTIO namespace. As pointed out in #1978, patch versions shouldn't change the API, but we were making every release unique by including the patch number in the API itself.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.13%. Comparing base (4af7407) to head (63883e1).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1979   +/-   ##
=======================================
  Coverage   85.13%   85.13%           
=======================================
  Files         181      181           
  Lines       12783    12783           
  Branches     1206     1206           
=======================================
  Hits        10883    10883           
  Misses       1717     1717           
  Partials      183      183           

Flag	Coverage Δ
py-unittests	85.13% <ø> (ø)

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

Files with missing lines	Coverage Δ
src/opentime/errorStatus.cpp	55.55% <ø> (ø)
src/opentime/errorStatus.h	100.00% <ø> (ø)
src/opentime/rationalTime.cpp	84.76% <ø> (ø)
src/opentime/rationalTime.h	95.83% <ø> (ø)
src/opentime/stringPrintf.h	57.14% <ø> (ø)
src/opentime/timeRange.h	98.38% <ø> (ø)
src/opentime/timeTransform.h	100.00% <ø> (ø)
src/opentimelineio/algo/editAlgorithm.cpp	0.00% <ø> (ø)
src/opentimelineio/anyDictionary.h	96.61% <ø> (ø)
src/opentimelineio/anyVector.h	90.32% <ø> (ø)
... and 55 more

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[darbyjohnston]

@reinecke Thinking about this after the meeting, I just wanted to call out that this PR does change the API by replacing OPENTIMELINEIO_VERSION with OPENTIMELINEIO_VERSION_NS.

So if people are using this in their C++ code:

namespace otio = opentimelineio::OPENTIMELINEIO_VERSION;

They will have to update it to this:

namespace otio = opentimelineio::OPENTIMELINEIO_VERSION_NS;

We provide the OTIO_NS macro as a shortcut, which hopefully most people are using, but not everyone might know about it. I wasn't sure how to fix this without making this change, so I'm open to any other ideas.