iou: try consume CQEs in batches

The code has been basically in the same "let's get io_uring
working" form since libiou was first written.

Looking more at the uring API, there's a non-waiting batched CQE
consumer.  If enough SQEs are outstanding and being processed
fast enough, this could net a big efficiency gain.

Currently just using a max batch size of 16 which seemd like a
reasonable upper bound of operations to potentially grind on
before revisiting sqe flushing and async completions.

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