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Add 3d kdtree construction and nearest neighbor search

caseywang777 requested to merge caseywang777/vtk-m:kdtree into master

Add 3d kdtree construction and nearest neighbor search with unit test in worklet folder.

This could increase the speed of particle data access.

The kdtree construction reference: "Portable Data-Parallel Visualization and Analysis in Distributed Memory Environments" (LDAV2013)

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