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WIP: Use ArrayHandleMultiplexer in VariantArrayHandle::CastAndCall

Kenneth Moreland requested to merge kmorel/vtk-m:variant-cast-call-multiplexer into master

The previous behavior of VariantArrayHandle::CastAndCall was to identify all possible ArrayHandles to try and call the provided functor with each one. This change creates an ArrayHandleMultiplexer for each value type so that the functor need only be called once for each value type rather than once for every value-storage type pair.

This results in more complex array types, but should result in fewer total code paths.

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