Support component extraction from ArrayHandleConstant better

Kenneth Morelandrequested to merge
kmorel/vtk-m:arrayhandleconstant-extract-component into master

Previously, ArrayHandleConstant did not really support component extraction. Instead, it let a fallback operation create a full array on the CPU.

Component extraction is now quite efficient for ArrayHandleConstant. It creates a basic ArrayHandle with one entry and sets a modulo on the ArrayHandleStride to access that value for all indices.

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