Implement parallel Happy Eyeballs as described in RFC 8305

What is the problem this feature will solve?

autoSelectFamily is enabled by default in Node.js 20. However, it does not properly implement parallel connection attempts, which are an integral part of the Happy Eyeballs algorithm. This can cause timeouts to occur that did not occur in versions prior to Node.js 20. See, for example, this discussion.

What is the feature you are proposing to solve the problem?

Implement the algorithm as described in Section 5 of RFC 8305:

Starting a new connection attempt does not affect previous attempts, as multiple connection attempts may occur in parallel.

What alternatives have you considered?

Disabling autoSelectFamily and restoring the pre-20 behavior, see https://github.com/nodejs/node/issues/47644#issuecomment-1554440759.

Inizia con la Section 5 di RFC 8305 e confronta i relativi requisiti per i tentativi di connessione paralleli con il comportamento attuale di autoSelectFamily di Node.js. Usa la discussione collegata e il comportamento precedente alla versione 20 citato nell’issue per comprendere la regressione; il lavoro è completato quando i tentativi di connessione possono procedere in parallelo senza influire sui tentativi precedenti e il comportamento di timeout segnalato viene risolto.