Adopt CUDA stream compatibility accessors - #23995
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Description
Use the
get()compatibility alias added in RMM #2537. This spelling is shared byrmm::cuda_stream_viewandcuda::stream_ref.This preserves existing stream types and public APIs while extracting mechanical accessor updates from the broader stream migration. It is independently buildable without RMM #2372 and leaves the migration PR focused on actual type and signature changes.
This updates raw stream extraction at Cython boundaries and uses the CUDA stream umbrella header where stream definitions are required, without changing libcudf stream types or public APIs. The remaining type, construction, and forwarding changes stay in cuDF #23929.
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