Fix drag/drop teleop

[fracapuano]

Part of PR stack

• 👀 Add camera pose editors plugins #1397

Fixes the issue with current teleoperation-in-sim on macOS with a Panda arm.

• Reliance on mplib made the teleoperation script provided in the docs crash on macOS, as mplib is only supported on Linux.
• This PR replaced mplib using native EE-control via IK. Of course, collision avoidance remains an open challenge in this case
• Nonetheless, I would argue that the simplicity of tasks one can perform with this way of teleoperation is enough that we could neglect motion planning and leave it at simple ee-tracking.
• Curious to know what you think of this @StoneT2000 🙌

Demo 👇

Next up (stacking on this PR) recording and push of dataset to LeRobot, directly in teleop