Add core C++ support for otioz and otiod, take 2

[darbyjohnston]

Fixes #1869

This PR adds support for otioz and otiod bundles to the C++ API. This PR is a second attempt at adding the functionality, superseding PR #1901.

The python otioz and otioz adapters still exist and work the same, but now they call into the C++ code for the bundle functionality.

Support for image sequences and multiple media references has been added.

Other changes:

• Added the "miniz" dependency for working with ZIP files. The miniz source code was added to the deps directory to simplify the build process (as opposed to building it as a library from a submodule).
• Added a C++ example for working with bundles.
• Replaced most of the Python bundle tests with C++ tests. Minimal Python tests remain to verify the adapters still work.

Questions:

• Should the otioz/otiod file versions be bumped?
• Should miniz be a sub-module? (consistent with the other dependencies, but complicates the build)
• Should we use a third party library for URL handling? We currently only need a single function, to return a filename from a URL.

Assisted-by: Claude:claude-opus-4-7 [code-review] [debugging]

[codecov-commenter]

Codecov Report

❌ Patch coverage is 50.67873% with 218 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.34%. Comparing base (7adfb27) to head (507527d).

Files with missing lines	Patch %	Lines
src/opentimelineio/bundle.cpp	43.05%	201 Missing ⚠️
...timelineio/opentimelineio-bindings/otio_bundle.cpp	69.04%	13 Missing ⚠️
...py-opentimelineio/opentimelineio/adapters/otioz.py	66.66%	2 Missing and 1 partial ⚠️
...py-opentimelineio/opentimelineio/adapters/otiod.py	87.50%	1 Missing ⚠️

❌ Your changes status has failed because you have indirect coverage changes. Learn more about Unexpected Coverage Changes and reasons for indirect coverage changes.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2021      +/-   ##
==========================================
- Coverage   84.50%   83.34%   -1.17%     
==========================================
  Files         181      180       -1     
  Lines       13225    13317      +92     
  Branches     1202     1218      +16     
==========================================
- Hits        11176    11099      -77     
- Misses       1866     2046     +180     
+ Partials      183      172      -11     

Flag	Coverage Δ
py-unittests	83.34% <50.67%> (-1.17%)	⬇️

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

Files with missing lines	Coverage Δ
...melineio/opentimelineio-bindings/otio_bindings.cpp	98.63% <100.00%> (+<0.01%)	⬆️
src/py-opentimelineio/opentimelineio/__init__.py	100.00% <ø> (ø)
...opentimelineio/opentimelineio/adapters/__init__.py	85.18% <ø> (ø)
tests/test_otiod.py	91.30% <100.00%> (-5.58%)	⬇️
tests/test_otioz.py	91.30% <100.00%> (-6.64%)	⬇️
...py-opentimelineio/opentimelineio/adapters/otiod.py	84.61% <87.50%> (+3.66%)	⬆️
...py-opentimelineio/opentimelineio/adapters/otioz.py	71.42% <66.66%> (-13.19%)	⬇️
...timelineio/opentimelineio-bindings/otio_bundle.cpp	69.04% <69.04%> (ø)
src/opentimelineio/bundle.cpp	43.05% <43.05%> (ø)

... and 1 file with indirect coverage changes

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 7adfb27...507527d. Read the comment docs.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.