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On iOS, when a tap is detected in the status bar, provide a means to pass that touch event through to one or more FlutterViewControllers to trigger a scroll to top. In iOS apps, scroll to top should occur under the following conditions: 1. There is one and only one UIScrollView visible with scrollsToTop == YES. 2. The status-bar is in standard height mode, not in double-height mode. In double-height mode, the expected behaviour is to trigger a switch to the application associated with the double-height status bar. 3. A tap or a drag gesture occurs that is entirely constrained to the status bar frame. (We currently only handle the tap scenario). Unfortunately, AppDelegates only get touchesBegan events for status bar taps, though get get touchesBegan and touchesEnded events for drags within the status bar frame. As such, we currently synthesise the touchesEnded event for taps.
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