Avoid serializing I/O requests from Parquet reader - #23823
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Description
Closes #23799
This PR adds a boolean flag in
parquet_io_utilsto enable serializing (via mutex) I/O submission from callers. The boolean flag defaults totrueenabling serialization for better pipelining between IO and compute.Parquet reader path (libcudf internal) now passes a
falseto this flag reverting its old behavior. Hybrid scan paths remain unchanged.Checklist