feat(google-maps): Add map-info-window component

Fix import statement for info window by adding /index.

Author: mbehrlich

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

@@ -15,7 +15,7 @@ import {
 import {BehaviorSubject, combineLatest, Observable, Subject} from 'rxjs';
 import {map, shareReplay, take, takeUntil} from 'rxjs/operators';
 
-import {MapInfoWindow} from '../map-info-window';
+import {MapInfoWindow} from '../map-info-window/index';
 import {MapMarker} from '../map-marker/index';
 
 interface GoogleMapsWindow extends Window {