[Proposal] Show newton backend on screen

[johnnynunez]

Proposal

When I run a demo with newton backend is showing physx on the screen. This can be confusing for non-technnical people, beginners or general public if we show a visual demo.
If you look on terminal or logs, of course, it us running newton backend.

Motivation

Clarify what backend it is executing. This is useful for showcase demos.

Build Info

Describe the versions where you are observing the missing feature in:

Internal rc49 build with latest isaac lab commit

Checklist

• I have checked that there is no similar issue in the repo (required)

Acceptance Criteria

Show at somewhere newton backend or physics backend is running.

Images:

Newton Backend:

IsaacSim kit visualizer: