Adds the ability for kubric to load USD formats.

[burrussmp]

Adds the ability for kubric to load USD formats.

Extensions include usda, usd, usdc, and usdz.

Loads using a parenting approach.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.

Project coverage is 65.6%. Comparing base (0ee21e2) to head (942c51d).

Files with missing lines	Patch %	Lines
kubric/renderer/blender.py	0.0%	5 Missing :warning:

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #339     +/-   ##
=======================================
- Coverage   65.7%   65.6%   -0.1%     
=======================================
  Files         43      43             
  Lines       3596    3601      +5     
=======================================
  Hits        2363    2363             
- Misses      1233    1238      +5     

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