UsdaData CanReead methods are unimplemented

[dgovil]

Looking at the USDAData class methods here, we're seeing that they're unimplemented.
I don't see an inheritance or other implicit fallback for them either.

OpenUSD/pxr/usd/sdf/usdaData.h

Line 34 in b46f16c

CanRead(const std::string& assetPath);

Is this something that was intentional and I'm misunderstanding it, or should these be cleaned up?
I removed them locally and see no compilation failures.

I suspect these are vestigial and we should be using the ones in SdfUsdaFileFormat instead.

[spiffmon]

Yeah, looks like it was following the pattern of CrateData, which does use its own, but the FileFOrmat CanRead() is the used/important one. I think can be removed till we have a need for it.

[jesschimein]

Filed as internal issue #USD-11779

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