can you add an example for mjlab please?

[IsaakBtue]

As more and more people are using mjlab frequently would love to see it implemented in there as well!

[xbpeng]

Newton already uses Mujoco Warp as one of its backends, so having mjlab, which is another Mujoco Warp-based engine, seems a bit redundant. We don't currently have plans to add an mjlab engine for now. But if someone is interested in setting that up, it would be helpful to share it with others.