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.

从 RFC 8305 的 Section 5 开始，将其中关于并行连接尝试的要求与 Node.js 当前的 autoSelectFamily 行为进行比较。使用链接的讨论以及 issue 中引用的 pre-20 行为来了解这次回归；当连接尝试可以并行进行且不影响更早的尝试，并且报告的 timeout 行为得到处理时，即视为完成。