[FEA]: cluster-scope barrier

### Is this a duplicate?

- [x] I confirmed there appear to be no [duplicate issues](https://github.com/NVIDIA/cccl/issues) for this request and that I agree to the [Code of Conduct](CODE_OF_CONDUCT.md)

### Area

Thrust

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

Provide a sm_90 cluster-scope barrier API abstraction.

### Describe the solution you'd like

-

### Describe alternatives you've considered

_No response_

### Additional context

_No response_

The issue identifies Thrust as the affected area and requests an API abstraction for an sm_90 cluster-scope barrier. No files, tests, or entry points are named, so first locate the relevant Thrust synchronization or barrier APIs and review how architecture-specific features are exposed. Done means the requested abstraction is defined for sm_90 and covered by appropriate validation.

Written by the indexing model from the issue text.