Support OpenImageIO 3.x inside the hioOiio plugin

[jessey-git]

Description of Change(s)

The soon to be released OpenImageIO 3.x series drops a variety of old, deprecated, methods and types.

In the context of the imaging hioOiio plugin, this simply means to adjust the following [1]:

• The ImageIOParameter type alias is removed and just ParamValue should be used
• The read_image method must take in subimage, miplevel, and channel values explicitly

These changes are compatible with the OpenImageIO 2.x series and shouldn't present a problem for those not updating just yet.

[1] https://github.com/AcademySoftwareFoundation/OpenImageIO/blob/main/docs/Deprecations-3.0.md#imageioh

Fixes Issue(s)

• Building against OIIO 3

• I have verified that all unit tests pass with the proposed changes

• I have submitted a signed Contributor License Agreement

[jesschimein]

Filed as internal issue #USD-10319

[jesschimein]

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