Thrust universal_host_pinned_memory_resource's pointer type should probably be a universal_ptr

[bernhardmgruber]

We have the alias universal_host_pinned_memory_resource in each system with a comment that it is an alias to universal_memory_resource, which is a lie. IMO, universal_host_pinned_memory_resource should be an alias to universal_memory_resource except for the CUDA system. The current state is inconsistent, because the pointer type of universal_host_pinned_memory_resource is a native pointer and a not a universal_ptr<T>, like for universal_memory_resource. Fixing this is technically a breaking change.

We should address this in the next major release.

Originally posted by @bernhardmgruber in #2653 (comment)