Adds the ability to use parenting instead of joining when loading GLB.

[burrussmp]

Adds the ability to use parenting instead of joining when loading GLB.

NOTE: Intentionally left out "glb_" prefix to option as this could eventually be applied to other filetypes on load, for example, USD.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 8.00000% with 23 lines in your changes missing coverage. Please review.

Project coverage is 65.7%. Comparing base (a9e4113) to head (d9b547e).

Files with missing lines	Patch %	Lines
kubric/renderer/blender.py	4.1%	23 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #338     +/-   ##
=======================================
- Coverage   65.9%   65.7%   -0.3%     
=======================================
  Files         43      43             
  Lines       3582    3596     +14     
=======================================
+ Hits        2361    2363      +2     
- Misses      1221    1233     +12     

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[Qwlouse]

Very nice! Thanks a lot for implementing this.