Delegate to an impl allocate/deallocate method to allow specifying a SpaceHandle for MemorySpaces

[DavidPoliakoff]

This is something I need to enable LogicalMemorySpaces, which are memory spaces that are functionally some other memory space (HostSpace, CudaSpace), but differentiable by tools and templates. When we moved all of the Profiling callbacks into the allocate/deallocate calls (in #3084 ), I lost the ability to "lie" to the Profiling system by handing it a SpaceHandle from the LogicalMemorySpace.

This sketch shows the changes I'd need to get that ability back, I implement it with HostSpace but can extend it to any memory space. Basically we add an impl_allocate/impl_deallocate pair of functions which take their SpaceHandles as arguments. All the other allocate/deallocate functions just call that function, passing a SpaceHandle of the current memory space

I need people to say "this is okay" or "this is not" before I implement this throughout Kokkos

[DavidPoliakoff]

This is going through CI, but it's promising. I'm opening it up for thorough review

[dalg24]

Changes look fine to me although I must say I don't fully understand how you intend to use these at the end.

[DavidPoliakoff]

@dalg24 totally fair. I may be overdoing the "make PR's into smaller chunks" thing, here, in the future I'll make sure things happen in comprehensible chunks