Look at using MDSpan accessors for hooks

[nmm0]

E.g. explore if hooks_policy in ViewTraits can be removed and replaced with an accessor with the mdspan refactor.

See: kokkos/kokkos#7350

[nmm0]

If we can wrap Kokkos's SharedAllocation handle_type we could potentially track allocations and checkpoint by them. This would also allow us to avoid duplicate checkpoints for things like subviews