Send scroll events from the macOS shell (#8056)
Adds scroll event handling to the macOS shell, sending them using the new embedding API. Currently, trackpad scrolling is just handled like scrollwheel scrolling, since the trackpad-gesture-based scroll handling in Flutter is still in progress. Adds code to synthesize Add events if mouse tracking isn't enabled, so that it doesn't rely on Flutter being lenient about handling events from pointers that have never been added.
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