feat(google-maps): Add map-marker component

Fix type bug with map marker tests.

Author: mbehrlich

src/google-maps/map-marker/map-marker.spec.ts

@@ -177,8 +177,8 @@ describe('MapMarker', () => {
     markerSpy.getOpacity.and.returnValue(5);
     expect(markerComponent.getOpacity()).toBe(5);
 
-    markerSpy.getPosition.and.returnValue({lat: 1, lng: 2});
-    expect(markerComponent.getPosition()).toEqual({lat: 1, lng: 2});
+    markerSpy.getPosition.and.returnValue(null);
+    expect(markerComponent.getPosition()).toEqual(null);
 
     markerSpy.getShape.and.returnValue(null);
     expect(markerComponent.getShape()).toBe(null);

src/google-maps/public-api.ts

@@ -7,4 +7,3 @@
  */
 
 export * from '@angular/google-maps/google-map';
-export {MapMarker} from './map-marker/map-marker';