[WIP][VL] Support GPU async native shuffle read#12370
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The parallelism of gpu stages is limited by the GPU concurrency, but the shuffle read process, which includes data fetching, decompression and deserialisation, are still running on CPU. In this case we can parallelise these process to produce the output data asynchronously.
This PR adopts a producer–consumer design. Producer threads asynchronously perform shuffle reads, including data fetching, decompression, and deserialization, and produce decoded data. The consumer (the main thread) retrieves the prepared data as it becomes available and creates the corresponding device buffers.