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[IO] make the behavior of the completer thread configurable

Maxim Onciul requested to merge configurable_io_completer into master

Available behaviors:

  • none - the completer thread is not started

  • schedule (default) - the completer thread will reap and schedule available completions from worker IoContexts

  • wakeup - the completer thread will wakeup all workers if it observes completions in a worker IoContext. The Fiber produced by the completion will be scheduled when the worker in which's IoContext the cqe lies reaps its completions.

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