get Style Default Camera
Returns the map style's default camera, if any, or a default camera otherwise.The map style's default camera is defined as follows:- [center](https://docs.mapbox.com/mapbox-gl-js/style-spec/#root-center)- [zoom](https://docs.mapbox.com/mapbox-gl-js/style-spec/#root-zoom)- [bearing](https://docs.mapbox.com/mapbox-gl-js/style-spec/#root-bearing)- [pitch](https://docs.mapbox.com/mapbox-gl-js/style-spec/#root-pitch)The style default camera is re-evaluated when a new style is loaded.
Return
The default `camera options` of the current style in use.