Justin Johnson 9f31a4fd46 Expose knn_check_version in python
Summary:
We have multiple KNN CUDA implementations. From python, users can currently request a particular implementation via the `version` flag, but they have no way of knowing which implementations can be used for a given problem.

This diff exposes a function `pytorch3d._C.knn_check_version(version, D, K)` that returns whether a particular version can be used.

Reviewed By: nikhilaravi

Differential Revision: D21162573

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