Add ares_queue_active_queries() - #712
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Add a function to request the number of active queries from an ares channel. This will return the number of inflight requests to dns servers. Some functions like
ares_getaddrinfo()when usingAF_UNSPECmay enqueue multiple queries which will be reflected in this count.In the future, if we implement support for queuing (e.g. for throttling purposes), and/or implement support for tracking user-requested queries (e.g. for cancelation), we can provide additional functions for inspecting those queues.
Fix By: Brad House (@bradh352)