[ON-HOLD]  Add Manipulator Arm to Go1 (ROS 2)

**Description**
Integrate a manipulator arm with the Go1 robot in ROS 2. First attempt will be to port the Sagittarius K1 arm from ROS 1; if that fails, use a compatible alternative.

**Tasks**

* [ ] Port or select a suitable manipulator arm
* [ ] Create a ROS 2 package
* [ ] Integrate with Go1 (simulation & control)
