[Proposal] Support Cone Asset in Newton

[YizeWang]

Proposal

Add Newton backend support for the Cone asset. This would allow cone-shaped geometry to be spawned and simulated consistently when using Newton, matching the existing Kit-based behavior.

Motivation

Cone assets are useful for markers, props, and simple collision geometry. Currently, workflows that rely on cones cannot fully run with Newton and may need to remain Kit-only or use approximations.

Build Info

• Isaac Lab Version: On top of Support Multi-Back for Demo Scripts (Part 2) and Unify Code Structure #6140
• Isaac Lab Contrib Version: 0.4.4
• Isaac Lab Newton Version: 0.15.2
• Isaac Sim Version: 6.0.0-alpha.212

Checklist

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

Acceptance Criteria

• Cone assets can be spawned when using Newton.
• Cone geometry behaves correctly for visualization and collision where applicable.

[RandomOakForest]

Thank you for posting this. @zoctipus for vis.