[FEA] Use RAFT get/set_current_device_resource() wrappers in cuVS

[harrism]

Is your feature request related to a problem? Please describe.
To reduce thrash due to RMM refactoring, RAFT is adding wrappers around RMM rmm::get_current_device_resource(), rmm::set_current_device_resource() and aliases for RMM resource_ref types.

Using these will allow us to change them in a single location in RAFT without having to touch every file that uses memory resources.

Additional context
See rapidsai/raft#2423
and
rapidsai/raft#2424