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Vendor the `CubicInterpolationCUDA` code, improve texture memory management

Paul McCarthy requested to merge mnt/vendor-cubic-interp-library into master

Vendor the CubicInterpolationCUDA library, and update it to use the CUDA texture object API instead of texture references, support for which has been removed in CUDA 12.

Compile the CubicInterpolationCUDA as a stand-alone library (libCubicInterp.a), and link against it, rather than #include-ing source files.

Add a new TextureHandlePitched class which manages creation of 3D textures on which interpolation is performed.

Update the VolumeBSpline class to use the above.

Add some unit tests for the VolumeBSpline class, and for the CubicInterp functions.

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