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Bridge old-style ArrayHandle to new-style

Kenneth Moreland requested to merge kmorel/vtk-m:bridge-old-and-new-style-arrayhandle into master

The new-style ArrayHandle uses Buffer objects to manage data. Thus, when one is decorating the other, it expects to find the Buffer objects, which the old-style ArrayHandles do not have. To make the two work together, fake buffers in the old-style arrays.

The buffers in old-style arrays are empty, but have metadata that points back to the `ArrayHandle.

This change will allow us to update the rest of the ArrayHandles to the new style one at a time. The dependencies will not matter. Thus, we can keep smaller MRs.

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