add counting_scope compatible with alien coroutines#45
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Add
counting_scopecompatible with "alien" coroutine family.This utility allows starting tasks eagerly. Inspired by
std::counting_scopebut with a notable difference for joining, that is here we havejointhat blocks the calling thread until all work in the scope is done, instead of havingon_emptywhich produces a tasks that finishes when all the work is done.