Adds transform for mesh_prim of ray caster sensor (#1448)

# Description

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Currently, ray-saster does not apply transform to the mesh that is cast
against by ray.
As a result, no matter where the mesh is, the ray caster get data as
same as when the mesh is in the pos (0,0,0) with quat (1,0,0,0).

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## Type of change

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- Bug fix (non-breaking change which fixes an issue)

## Screenshots

I use a red cube to mark the position of ray caster sensor, and use
LidarPattern to generate ray for more intuitive visual effects.

Before fixed, when the mesh is in the center with pos=(0.0, 0.0, 0.0),
rot=(1.0, 0.0, 0.0, 0.0), the result will be right.


![screenshot0](https://github.com/user-attachments/assets/b117e12d-ee94-452a-a223-5446f2586c29)

However, if pos=(1.0, -2.0, 0.0), rot=(0.816, 0.577, 0.0, 0.0), it
causes bug as:


![screenshot1](https://github.com/user-attachments/assets/1e3a2d52-201b-43da-ade1-19255b1bcfed)

After fixed, the result will be right:


![screenshot2](https://github.com/user-attachments/assets/76f757c4-fca7-4b2b-89e1-1da21eb4e0cd)

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## Checklist

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`./isaaclab.sh --format`
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- [x] 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
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exists there

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Co-authored-by: Kelly Guo <[email protected]>

source/extensions/omni.isaac.lab/omni/isaac/lab/sensors/ray_caster/ray_caster.py

@@ -175,6 +175,9 @@ def _initialize_warp_meshes(self):
                 mesh_prim = UsdGeom.Mesh(mesh_prim)
                 # read the vertices and faces
                 points = np.asarray(mesh_prim.GetPointsAttr().Get())
+                transform_matrix = np.array(omni.usd.get_world_transform_matrix(mesh_prim)).T
+                points = np.matmul(points, transform_matrix[:3, :3].T)
+                points += transform_matrix[:3, 3]
                 indices = np.asarray(mesh_prim.GetFaceVertexIndicesAttr().Get())
                 wp_mesh = convert_to_warp_mesh(points, indices, device=self.device)
                 # print info