Add a wait(::[Abstract]WorkerPool)
#48238
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I was surprised to find that there was no method for
Base.waiton aWorkerPoolwhich blocks until a worker is ready and then returnsnothing. This adds a straightforward method based on thewp_local_$fpattern, that just callswait(pool.channel). I've added tests (for both local and remote invocations) and will update docs as well.