Add loading prop to Checkbox

[juliusn]

The <Checkbox> component could use similar loading prop as in <Button> for cases where the value is controlled and you need to complete a request before setting the value. Using the disabled prop is not as informative as, e.g. a spinning animation. There may be other input components for which the same feature could be added as well.

<Checkbox
  checked={checked}
  loading={loading}
  onChange={async (event) => {
    setLoading(true);
    // asynchronous code
    setLoading(false);
  }}
/>

[MariaBanaszkiewicz]

Hi! I also think this prop would be usefull. I would love to implement this feature! :)