[NDArray] Allow creating a view from a strided array

[masahi]

Currently, NDArray::CreateView(...) requires the strides of the input array to be null. This makes it impossible to apply, for example, reshaping on an array which originally comes from PyTorch via from_dlpack.

This PR relaxes the null check to allow non-null strides, as long as they are "compact". But after creating a view, the returned array no longer has strides.

This is a subset of new functionalities from another PR #14771, which ended up causing disruptive changes across the stack.

@Lunderberg @tqchen @vinx13 @yelite @sunggg

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[Lunderberg]

The changes look good, and it makes sense to split out the utility from the more disruptive parts of #14771.