Add 3D test for DistributedClosestPoint

[gunney1]

DistributedClosestPoint has been used in 3D, but Axom only tests it in 2D. These steps constitute a simple extension for testing the search in 3D.

1. Extend the circle to a sphere by adding a polar angle.
2. Add command-line option for the resolution of the object mesh in the polar angle dimension.
3. Partitioning can remain the same as in 2D. Partition the azimuthal direction only, so that the sphere is partitioned into wedges.