Expand OBJ utility

[Troy-Ferrell]

Describe the problem

OBJ Utility in #6361 has two current issues:

1. Only saves OBJs at runtime, does not load
2. Only targets Unity GameObjects/meshes. Does not offer ability to directly provide array of vectors3 which can be totally async and not a coroutine

Loading should also offer both loading and creating a GameObject as well as loading data into a struct...so again things can be totally async background thread

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Additional context

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[keveleigh]

List item 1 should be solvable using https://docs.microsoft.com/en-us/windows/mixed-reality/mrtk-unity/features/spatial-awareness/spatial-object-mesh-observer?view=mrtkunity-2021-05

List item 2 does sound interesting to move away from referencing scene objects and thus the main thread requirement. We've added this to the backlog as a potential 3.x timeframe improvement.

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