By input of multiple Slice!(kind, N, T*) objects, produces one Slice!(kind, [N+1], T*)
object, where length of last dimension is number of input slices. Values
of input slices' elements are copied to resulting slice, where [..., i] element
of j-th input slice is copied to [..., i, j] element of output slice.
e.g. If three single channel images (Slice!(kind, [2], Iterator)) are merged, output will be
a three channel image (Slice!(kind, [3], Iterator)).
Merge multiple slices into one.
By input of multiple Slice!(kind, N, T*) objects, produces one Slice!(kind, [N+1], T*) object, where length of last dimension is number of input slices. Values of input slices' elements are copied to resulting slice, where [..., i] element of j-th input slice is copied to [..., i, j] element of output slice.
e.g. If three single channel images (Slice!(kind, [2], Iterator)) are merged, output will be a three channel image (Slice!(kind, [3], Iterator)).