v2.1.0

This release actually dates back to 31 July 2024, I forgot to publish it here 😊

Added

• Add --variant keyword argument to all examples
• Add camera_eye frame to the camera variant
• Add an empty visual box to each virtual link
• CICD: Add Python workflow

Changed

• Replace the virtual_link_inertia Xacro macro by virtual_link

Fixed

• Rendering of the IMU frame orientation in MeshCat
• Rendering of virtual-link frames in MeshCat