Adds an option for GLBs to apply all transforms after import

[rmbrualla]

This is done before the meshed objects are joined, and the non-meshes objects are discarded.

This fixes issues with objects not retaining the standard orientation (e.g. the one seen when loading them on Blender), as the orientation is stored in a parent node, that is discarded during the GLB loading.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 65.9%. Comparing base (8fe9429) to head (ea09d13).

Files	Patch %	Lines
kubric/renderer/blender.py	0.0%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #312     +/-   ##
=======================================
- Coverage   65.9%   65.9%   -0.1%     
=======================================
  Files         43      43             
  Lines       3578    3581      +3     
=======================================
+ Hits        2360    2361      +1     
- Misses      1218    1220      +2     

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