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Add first pass of MaterialX versioning proposal #1

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Description of Proposal

MaterialX versioning in OpenUSD - add the ability to leverage the MaterialX automatic upgrade code path, by recording the MaterialX library version in the OpenUSD document

Link to Rendered Proposal

Supporting Materials

None

Contributing

The following is an example of a `Material` primitive with the applied schema applied.
```
def "Material" MyMaterial (
prepend apiSchemas = ["MaterialXVersionAPI"]
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Just spitballing, but could it be useful to have this be MaterialXInfoAPI so that in the future we could add more data hints as needed? One thing that comes to mind is the idea of being able to point to specific MaterialX shader libraries, or perhaps if MaterialX adds any other parameters that apply globally.

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