This PR pushes some changes from our internal RAI fork of Isaac Lab.

The 2 main changes are:

Adds a new ray_alignment parameter to replace the previous yaw_only arg.

Now the ray alignment can be aligned to world, yaw, or `base.

Improves drift height sampling

At the moment, the RayCasterCfg hosts a parameter called drift_range. It allows to randomize the position of the sensor in world frame, which comes with a couple of downsides:

• If the projection is done along the gravity vector, the z-component drift term cannot be visualized (it is implicitly given in the pose, and added to the height scan in the observation term).
• The perturbation is applied in world frame, i.e., if the ray cast is yaw aligned, then the drift varies with the yaw angle
• The drift is applied to all (x,y,z) components equally

This PR adds a new parameter ray_cast_drift_range. It gives more freedom in choosing the drift ranges as x, y and z components can be treated separately. It also applies the drift after projecting and rotating the ray cast points, i.e. the drift is now invariant under the yaw angle and the drift in z is can be visualized

I've added Fabian Jenelten and Jeonghwan Kim to this PR as they worked on these changes within RAI - I'm simply helping to push them up 😄

Type of change

• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• I have run the pre-commit checks with ./isaaclab.sh --format
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• I have updated the changelog and the corresponding version in the extension's config/extension.toml file
• I have added my name to the CONTRIBUTORS.md or my name already exists there