Support setting unmarshaller listener on binder

[plutext]

abstract class Binder supports setEventHandler but not setListener

So currently, it is necessary to do something like:

	public void setListener(Binder binder, Listener listener) throws IllegalAccessException, IllegalArgumentException, InvocationTargetException, NoSuchMethodException, SecurityException {
		
		org.glassfish.jaxb.runtime.v2.runtime.BinderImpl binderImpl = (org.glassfish.jaxb.runtime.v2.runtime.BinderImpl )binder;
		
		Method method = binderImpl.getClass().getDeclaredMethod("getUnmarshaller");
		method.setAccessible(true);
		Unmarshaller u  = (Unmarshaller)method.invoke(binderImpl);	
		u.setListener(listener);
	}

Please add setListener to Binder

[lukasj]

filed jakartaee/jaxb-api#228 to get this supported through API; meanwhile it is going to be supported by this implementation; in the other words - one can avoid reflection..