Delay embedded UIViews touch events until the framework says so. (#6665)
This allows the framework to decide whether and when a touch event sequence arrives to the embedded view. Which gives the framework the ability to manage hit testing and gesture disambiguation for embedded UIViews. We achieve this by wrapping each embedded UIView with another UIView that has a custom UIGestureRecognizer that delays touch events from being delivered, and another UIGestureRecognizer that makes sure to let Flutter know of events that are hit tested to the embedded view.
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