Python Binding for OpenVDB Points

[achrist3]

Is your feature request related to a problem? Please describe.

I work with large scientific data that I visualize in Houdini. Large scientific datasets are usually easiest to manipulate with scientific Python libraries. OpenVDB Points would be an awesome optimized way to encode these datasets that is recognized in Houdini, but pyopenvdb does not appear to support them currently.

Describe the solution you'd like

Bind the C++ OpenVDB Points functions to pyopenvdb.

Describe alternatives you've considered

We've tried using OpenVDB Floatgrids, but these limit us to uniform rectangular spacing. We sometimes write files in proprietary Houdini formats like GEO/BGEO, but we are not able to float our Houdini licenses to certain machines, and so require an open source option.

Additional context

This would benefit the scientific community as a whole.