[FEA]: Add a `ManagedMemoryResource`

[shwina]

Is this a duplicate?

• I confirmed there appear to be no duplicate issues for this request and that I agree to the Code of Conduct

Area

cuda.bindings

Is your feature request related to a problem? Please describe.

We don't expose a memory resource for allocating managed memory, it would be good to expose something like the UnifiedMemoryResource that we wrote for testing.

Describe the solution you'd like

Expose the memory resource we wrote for tests.

Describe alternatives you've considered

No response

Additional context

No response