Extend `prefer-explicit-assert` to report `findBy*` and `waitFor`

With `prefer-explicit-assert` enabled, `getBy*` usages without `expect` are reported, but `findBy*` and `waitFor` are not reported:

```
    screen.getByText('hey') // reported
    await waitFor(() => screen.getByText('hey')) // not reported
    await screen.findByText('hey') // not reported
```

What if we extended `prefer-explicit-assert` to report all of the above cases? 🤔 