new rule: no-side-effects-wait-for

Following the proposed for Kent at his post (https://kentcdodds.com/blog/common-mistakes-with-react-testing-library). I would like to suggest a new rule that detects side effects inside a wait-for:

❌ // wrong
await waitFor(() => {
  fireEvent.click(a)
  expect(b).toEqual('b')
})

✅ // correct
fireEvent.click(a)
await waitFor(() => expect(b).toEqual('b'))

[Belco90]

Awesome, thanks for your help 💪

[renatoagds]

Just to update! I’m finishing #133 this week and will start work on this one 🚀