Add PriorityQueue #27
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This adds a priority queue implementation which we've copied in some form or another to use as a queue for timeouts. We're currently using a simplified version in
amphp/http-serverand I've used similar code in some personal and work projects. @bwoebi would now like to use this inamphp/quicwithout having to copy the implementation yet again, so I'm proposing we add it here.This queue implementation provides ordering of array-keys based on an updatable priority. These array keys may then be used with a separate map to reference any other value, such as an object.