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add waitfd support, generalize IO sleep_strategy code and use MSG_RING

Maxim Onciul requested to merge io-sleep-main into master

This MR introduces the waitfd support used to evaluate the waitfd kernel interface for my master's thesis.

It generalizes the io_uring-based sleep strategy code by introducing the new AbstractIoSleepStrategy class containing most of the code needed for sleeping and notifications.

Additionally the MR uses the io_uring MSG_RING feature introduced in linux 5.18 greatly improving and simplifying the sleep code.

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