usdUtils: Adding PrimTypeValidator

[beersandrew]

Description of Change(s)

• added entries in plugInfo.json, validatorTokens.h
• added validation implementation and a test

Fixes Issue(s)

• https://github.com/orgs/PixarAnimationStudios/projects/3?pane=issue&itemId=65424937

• [X] I have verified that all unit tests pass with the proposed changes
• [X] I have submitted a signed Contributor License Agreement

[jesschimein]

Filed as internal issue #USD-10342

[jesschimein]

/AzurePipelines run

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