Adopt CUDA stream compatibility accessors - #2557
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Summary
Use the
get()andsync()compatibility aliases added in RMM #2537. These spellings are 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 CUDA, library, kernel-launch, and legacy API boundaries throughout cuVS while preserving current stream types. Changes that require RAFT to return
cuda::stream_refremain in cuVS #2521.