Publish Python library on PyPi?

Hello! I'm very excited about using OpenVDB, but I'm looking for a cross-platform, easy-to-install way of interacting with it. I have successfully compiled but it would be great to be able to install the python library like `pip install pyopenvdb`. I'm not sure of the challenges to do that, but I thought I would bring it up because having python packages available via `pip` decreases the startup cost by an order of magnitude, easily. Thoughts?

The issue proposes publishing OpenVDB's Python library on PyPI so users can install it with pip across platforms. Start by reviewing the existing compiled Python library and packaging workflow; done would require an agreed distribution approach and a working cross-platform pyopenvdb package.

Written by the indexing model from the issue text.