Summary:
Currently, `AccessibilityInfo.setAccessibilityFocus` is only available on iOS. The same behaviour can be achieved on Android by dispatching the proper accessibility event. I implemented the same function for Android, to make life slightly more convenient for the developer.
Today, developers must write something like this:
```
if (Platform.OS === 'ios') {
AccessibilityInfo.setAccessibilityFocus(reactTag)
} else {
UIManager.sendAccessibilityEvent(reactTag, 8)
}
```
With this change, the following is enough for both Android and iOS:
```
AccessibilityInfo.setAccessibilityFocus(reactTag)
```
Pull Request resolved: https://github.com/facebook/react-native/pull/20229
Differential Revision: D8874107
Pulled By: mdvacca
fbshipit-source-id: a6ffd7bb89ce56d6d65b06419633a71dcf3d0733
be715ec705