Expose AccessibilityInfo hooks

[6TELOIV]

Much like how useWindowDimensions is the prefered over Dimensions, AccessibilityInfo would benefit from hook versions of the properties it exposes.

All of the hooks would be fairly similar to the methodology used by useWindowDimensions. For example:

function useScreenReaderEnabled() {
  // Starting with state being `false` isn't ideal.
  // It would be better to have the correct inital state, but unfortunately, `AccessibilityInfo.isScreenReaderEnabled` is asyncronous
  // Possibly something could be implemented at the native level?
  const [screenReaderEnabled, setScreenReaderEnabled] = useState(false); 
    useEffect(() => {
      const subscription = AccessibilityInfo.addEventListener(
        "screenReaderChanged",
        (e) => {
          setScreenReaderEnabled(e);
        }
      );
      return subscription.remove;
    }, []);
    return screenReaderEnabled;
  }

Equivalent methods could be offered for boldTextEnabled, grayscaleEnabled, invertColorsEnabled, reduceMotionEnabled, and reduceTransparencyEnabled.