feat: add compatible constructor for marker DragEndEvent

Author: javier-godoy

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

@@ -261,10 +261,38 @@ public static class DragEndEvent extends ComponentEvent<GoogleMapMarker> {
     private final double lat;
     private final double lon;
 
+    /**
+     * Creates a new event with the drag end coordinates as separate lat/lon values.
+     *
+     * @param source the marker that was dragged
+     * @param fromClient whether the event originated on the client side
+     * @param lat the latitude of the drag end
+     * @param lon the longitude of the drag end
+     */
+    public DragEndEvent(
+        GoogleMapMarker source,
+        boolean fromClient,
+        @EventData("event.detail.latLng.lat()") double lat,
+        @EventData("event.detail.latLng.lng()") double lon) {
+      super(source, fromClient);
+      this.lat = lat;
+      this.lon = lon;
+    }
+
+    /**
+     * Creates a new event with the drag end coordinates as a JSON value.
+     *
+     * @param source the marker that was dragged
+     * @param fromClient whether the event originated on the client side
+     * @param latLng a JSON object containing {@code lat} and {@code lng} properties
+     * @deprecated since 2.6.0, for removal. Use
+     *     {@link #DragEndEvent(GoogleMapMarker, boolean, double, double)} instead.
+     */
+    @Deprecated
     public DragEndEvent(
         GoogleMapMarker source,
         boolean fromClient,
-        @EventData(value = "event.detail.latLng") JsonValue latLng) {
+        JsonValue latLng) {
       super(source, fromClient);
       this.lat = ((JsonObject) latLng).getNumber("lat");
       this.lon = ((JsonObject) latLng).getNumber("lng");