DM-51670: Add bbox property to BlendData classes

[fred3m]

Checklist

• ran Jenkins
• added a release note for user-visible changes to doc/changes

[codecov]

Codecov Report

❌ Patch coverage is 56.52174% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.41%. Comparing base (a2180ab) to head (9d32d40).
⚠️ Report is 2 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
python/lsst/scarlet/lite/io/hierarchical_blend.py	23.07%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #22      +/-   ##
==========================================
- Coverage   92.56%   92.41%   -0.16%     
==========================================
  Files          49       49              
  Lines        5410     5432      +22     
==========================================
+ Hits         5008     5020      +12     
- Misses        402      412      +10     

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[taranu]

Maybe make this a cached_property? It seems unusual to have a property return a new object every time, unless the Box's shape/origin can be reassigned. But then maybe it should be e.g. make_box.

[fred3m]

I wasn't family with cached_property, thanks for the suggestion. I wasn't too worried about it because this is not normally called and it's an inexpensive operation but since it should never change using cached_property seems like the way to go.