Justin Johnson e290f87ca9 Add CPU implementation for nearest neighbor
Summary:
Adds a CPU implementation for `pytorch3d.ops.nn_points_idx`.

Also renames the associated C++ and CUDA functions to use `AllCaps` names used in other C++ / CUDA code.

Reviewed By: gkioxari

Differential Revision: D19670491

fbshipit-source-id: 1b6409404025bf05e6a93f5d847e35afc9062f05
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