Replicate same office world from andino_gz

[francocipollone]

Summary

Migrate the exact same world we have for andino_gz to andino_isaac.
This will permit us to make a really good comparison when using both simulators.

• https://github.com/Ekumen-OS/andino_gz
• Blender's file: Feel free to ask for access.

Future

Afterwards, we can create a variant of the world using pure USD features that aren't typically allowed in Collada (used by gazebo) format to better showcase photorealistic scenarios

[JCarosella]

The office world just got merged, though it's empty and walls might need some tweaking to better reflect the real office. I'll keep this open to tackle those two issues:

• Improve walls
• Add assets