Uni-18840-sprint10_roundtrip_node_hierarchy

Test-ready C# FBX SDK that can support the import of a node hierarchy of with theirs names and transforms.

All required classes and minimal but complete methods have unit
tests and performance tests, if required.

Support import axis system compatible w Unity (UpVector = YAxis, FrontVector = ParityOdd, CoordSystem = LeftHanded)

Support import FBX w same unit system (1 unit = 1 meter)

Support round-trip comparison of the exported fbx hierarchy against the imported fbx hierarchy (file-based and deep-copy).