Add EntityBuilder DSL methods to add extra mouse event handlers, similar to existing onClick

[AlmasB]

Discussed in #1099

^{Originally posted by francescvc September 2, 2021}
On entityBuilder() I can setup an onClick((ent)-> { ... }) but on the click code I can't make difference upon the button clicked, that is the left one or right one. ¿How can I attach different events to both mousebuttons, or how can I distinguish wich one was clicked?

[chengenzhao]

how about a general method of mouse event
like

entityBuilder.onMouseEvent((entity, event) -> {
  if(event instanceof MouseDragEvent dragEvent){
    //drag event handler
  }else{
    //other normal mouse event handler
  }
});

?