This changes the way the the calculation for the largest visual
annotation representation (stored in
_unionedAnnotationRepresentationSize) is done so that it includes both
images and views. The `annotationTagAtPoint` method is then able to
find annotation objects that are in a query rect formed from the
sizes of all manner of point annotation visual representations.
The `annotationTagAtPoint` method also gains new logic in a conditional
to handle annotations backed by MGLAnnotationViews. Similarly to
the image case, it filters out disabled annotations and calculates
a centered rect for the view. The hit test logic remains the same but
now works correctly for both the centered rects of both images and views.
This also fixes a bug where the `largestAnnotationViewSize` was always
holding the last annotation view size and not necessarily the largest.
This would affect when annotation views are put into a reuse queue since
the size is used to help determine when an annotation view has gone
offscreen.