trunk/7da85ca47b7aec4f5dc133d856bb8ec5fc5b36c1: Add CUDA stream transport operations (#198918)

发生了什么

Add Transport.read_stream / write_stream , which order a transfer on a CUDA stream (default: current) and return once enqueued. Transfers can be captured with torch.cuda.graph . Ordinary read/write are unchanged. The default implementation works for any host-driven backend; backends with native stream support can override it. A host callback schedules write_async / read_async on a shared asyncio loop thread, and cuS…

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