Have some getter to retrieve the property name for something

Right now the name is only "visible" in the Q3DSPropertyChange returned by the setter.
However, slides work with the original property names as string:

slide1->addPropertyChanges(wonderfulCarModel, new Q3DSPropertyChangeList {
    Q3DSPropertyChange::fromVariant(QLatin1String("rotation"), QVector3D(0, 180, 0))
});
Q3DSAnimationTrack anim(Q3DSAnimationTrack::Linear, model1, QLatin1String("rotation.z"));

Hence the need for something that can be used to retrieve the name (which is "rotation" for Q3DSNode::rotation() in the above example, but is not always that straightforward)

For the editor this is a non-issue since it needs to work with the properties in the more dynamic manner (set values via applyPropertyChanges/Q3DSPropertyChangeList, not via the setters), and so the property names are expected to be known.