Add Fill method to ArrayHandle and BitField

Kenneth Morelandrequested to merge
kmorel/vtk-m:allocate-and-fill into master

ArrayHandle has a new method named Fill. As the name would suggest, the Fill method initializes all elements in the array to a specified value. In addition to being more convenient than calling Algorithm::Fill or ArrayCopy with a constant array, the ArrayHandle::Fill can be used without using a device adapter.

Also added a similar Fill and AllocateAndFill methods to BitField for similar reasons.

Fixes #642 (closed)

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