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Make decision how many workers to notify in Runtime

The decision how many workers should be notified on new work should be made in the runtime. This is the whole reason why WorkerWakeupStrategies provide notify{One,Many,All} functions.

This change also simplifies the logic used in SemaphoreWorkerSleepStrategy. The old simply copy-pasted semaphore based implementation could then be split up into much smaller and simpler pieces. SemaphoreWorkerSleepStrategy::notify{All, Many} is could actually be faster because it can now use the semaphores notify_many function instead of calling notifyInternal multiple times.

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