A simplistic wait function?

[RobinBobin]

Hi everyone,
How about adding a simplistic wait function:

const wait = async (timeout: number): Promise<void> => {
  await new Promise(resolve => {
    setTimeout(resolve, timeout)
  }
}

? I'll make a PR if no objections.

[aleclarson]

It's called sleep in Radashi 😄

This is definitely a time where #195 would have come in handy!