Bindings: UnknownSchema added data property

[natchar]

Fixes #1234

Python bindings return dictionary-type python object for UnknownSchema data.

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Codecov Report

Attention: Patch coverage is 88.88889% with 1 line in your changes missing coverage. Please review.

Project coverage is 81.61%. Comparing base (c0e97b0) to head (a8974b3). Report is 22 commits behind head on main.

Files with missing lines	Patch %	Lines
...entimelineio-bindings/otio_serializableObjects.cpp	66.66%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1799      +/-   ##
==========================================
- Coverage   84.11%   81.61%   -2.51%     
==========================================
  Files         198      176      -22     
  Lines       22241    12344    -9897     
  Branches     4687     3024    -1663     
==========================================
- Hits        18709    10075    -8634     
+ Misses       2610     1732     -878     
+ Partials      922      537     -385     

Flag	Coverage Δ
py-unittests	81.61% <88.88%> (-2.51%)	:arrow_down:

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

Files with missing lines	Coverage Δ
src/opentimelineio/unknownSchema.h	33.33% <100.00%> (+33.33%)	:arrow_up:
tests/test_unknown_schema.py	90.47% <100.00%> (+2.24%)	:arrow_up:
...entimelineio-bindings/otio_serializableObjects.cpp	93.51% <66.66%> (-0.35%)	:arrow_down:

... and 66 files with indirect coverage changes

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[jminor]

This looks good to me. Once this lands, then this feature in Raven should be easy to implement: https://github.com/OpenTimelineIO/raven/issues/26

@ssteinbach do you have any concerns with this?