feat: allow to close full screen mode

Close #130

Author: paodb

src/main/java/com/flowingcode/vaadin/addons/googlemaps/GoogleMap.java

@@ -841,4 +841,12 @@ public boolean isFullScreen() {
     }    
   }
 
+  /**
+   * Exits the full screen mode on the map.
+   */
+  public void closeFullScreen() {
+    this.getElement()
+        .executeJs("document.exitFullscreen();");
+  }
+  
 }