Autodesk: Expose additional header files in pxr/imaging/hdSt in the USD package

[erikaharrison-adsk]

Description of Change(s)

There are lots of files missing in the pxr/imaging/hdSt folder in the final package compared to the original source. Many of them are indispensable if we would like to use raw DrawItem. In additional, the classes in those missing files are all DLL exported. There are good reasons to expose them.  

• shaderKey.h
• drawBatch.h
• pipelineDrawBatch.h
• indirectDrawBatch.h
• materialNetworkShader.h
• resourceBinder.h

Also verified that making them public doesn't introduce symbol changes.

Link to proposal (if applicable)

• N/A

Fixes Issue(s)

• N/A

Checklist

• I have created this PR based on the dev branch

• I have followed the coding conventions

• I have added unit tests that exercise this functionality (Reference:
  testing guidelines)

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

• I have submitted a signed Contributor License Agreement (Reference:
  Contributor License Agreement instructions)

[jesschimein]

Filed as internal issue #USD-10557

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[jesschimein]

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