Humble-v2.1.0

• De-couple launch files from lbr_bringup for easier customization (breaking change):
  • Removed sim:=true / false argument from launch files in favor of dedicated launch files (since no feature parity between simulation and real robot)
  • MoveIt and RViz need to be launched separately now
  • User can now launch via:
    • ros2 launch lbr_bringup mock.launch.py (new: mock system)
    • ros2 launch lbr_bringup hardware.launch.py (real robot)
    • ros2 launch lbr_bringup gazebo.launch.py (Gazebo simulation)
• Added mock hardware to lbr_ros2_control (for simple ros2_control testing without the need for Gazebo, refer https://control.ros.org/humble/doc/ros2_control/hardware_interface/doc/mock_components_userdoc.html)
• Updated documentation