Redesign single tap event handling for annotations

[nishant-karajgikar]

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Summary of changes

This PR redesigns the way single tap gestures work in the MapView and each *AnnotationManager. The changes are motivated by a desire to make the GestureManager the home of all gesture related functionality. Accordingly, the GestureManager now owns a SingleTapGestureHandler (and exposes its associated gesture recognizer).

The singleTapGestureRecognizer is injected into the AnnotationsOrchestrator and then into any constructed *AnnotationManagers.

From a user's perspective, setting the AnnotationInteractionDelegate on an annotation manger results in a target-action being added to the singleTapGestureRecognizer.

[nishant-karajgikar]

Adding more tests..