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Add disk_file::AsyncDiskFile trait implementation for RawFileDiskSync with try_clone() and new_async_io() methods. try_clone() duplicates the underlying file descriptor and wraps it in a new RawFileDiskSync. new_async_io() creates a RawFileSync (synchronous fallback) backend, wrapping errors in BlockError instead of DiskFileError. Add DiskFileError::Clone variant in async_io.rs for the try_clone() error path. Signed-off-by: Muminul Islam <muislam@microsoft.com>