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

Fix bug with demo bazel file and with fake data for marker test.

Author: mbehrlich

src/dev-app/google-map/BUILD.bazel

@@ -8,6 +8,7 @@ ng_module(
     assets = ["google-map-demo.html"],
     deps = [
         "//src/google-maps/google-map",
+        "//src/google-maps/google-map-marker",
         "@npm//@angular/router",
     ],
 )

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

@@ -177,8 +177,8 @@ describe('GoogleMapMarker', () => {
     markerSpy.getIcon.and.returnValue('icon');
     expect(markerComponent.getIcon()).toBe('icon');
 
-    markerSpy.getLabel.and.returnValue('label');
-    expect(markerComponent.getLabel()).toBe('label');
+    markerSpy.getLabel.and.returnValue(null);
+    expect(markerComponent.getLabel()).toBe(null);
 
     markerSpy.getOpacity.and.returnValue(5);
     expect(markerComponent.getOpacity()).toBe(5);