ActionSheetIOS: closing the action sheet by touching/pressing on backdrop/empty-space

### Introduction

It would be useful to have a way to closing opened ActionSheetIOS by event with backdrop space.
Now, as far as I know, it's impossible.

### Details

I suggest to add this feature by applying a new param for showActionSheetWithOptions
```js
showActionSheetWithOptions({
  options: [...],
  closeByBackdrop: true // like that
})
```
