Extended demo of new SkeletonModifier3D nodes

[JekSun97]

Godot 4.4

Description:
After adding new SkeletonModifier3D nodes, such as:

• LookAtModifier3D
• RetargetModifier3D
• SpringBoneSimulator3D

I would like to have some kind of universal demo, where the method of using all three new nodes would be shown, since the description in the documentation is not enough, if with the LookAtModifier3D node everything is more or less intuitive, then with others it is not very clear how to work.

@TokageItLab
@fire

[fire]

We would welcome this. Let me see if I can post any samples from our usage.