Navigation.fromMap constructor
Implementation
factory Navigation.fromMap(dynamic navigationMap) {
  print("wemapMap : navigation ==> $navigationMap");
  return Navigation(
      itinerary: Itinerary.fromMap(navigationMap["itinerary"])
  );
}
factory Navigation.fromMap(dynamic navigationMap) {
  print("wemapMap : navigation ==> $navigationMap");
  return Navigation(
      itinerary: Itinerary.fromMap(navigationMap["itinerary"])
  );
}