Cell locator uniform bins 3

Dave Pugmirerequested to merge
dpugmire/vtk-m:cellLocatorUniformBins_3 into master

CellLocator that uses a uniform grid to bin the cells. This type of locator is more efficient for some mesh types (e.g., XGC) This is a redo of !2921 (closed)

Edited by Dave Pugmire

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