Add a wait() method

[kanongil]

With domain support going away in Hapi, an errant throw inside a setTimeout() will cause the uncaughtException event to be emitted. This can be mitigated by awaiting on a delay() method:

const delay = function (duration) {

    return new Promise((resolve) => setTimeout(resolve, duration));
};

This will change something like:

setTimeout(() => {
    /* my delayed code */
), 100);

to:

await delay(100);
/* my delayed code */

[hueniverse]

For now, I am writing these utilities locally where needed. As v17 gets more mature, we will collect these utils and put them here. I've been writing await internal.wait(100) quite a bit...

[lock[bot]]

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