Provide an option to decide if annotations should be deselected when moving the map

[captainbarbosa]

Similar to mapbox/mapbox-gl-native#8022, we should give developers the option to deselect annotations when panning and zooming on the map if they are in a selected state.

The solution to this will likely involve adding a new deselectsAutomatically property to MGLAnnotationController that checks if this option is true and then called the appropriate delegate methods accordingly (such as in https://github.com/mapbox/mapbox-annotation-extension/blob/master/MapboxAnnotationExtension/Views/MGLAnnotationLayerView.m#L48).