Improve speed profiles of the 3dof simulations

...dof/launch/kuka_rviz_simulation_3dof_sequential_launch.py

...f/launch/kuka_rviz_simulation_3dof_simultaneous_launch.py

...dof/launch/kuka_rviz_simulation_3dof_wheelchair_launch.py

ros2_ws/src/simple_robot_3dof/setup.py

..._3dof/simple_robot_3dof/forward_kinematics_node_3dof_3.py

...imple_robot_3dof/simple_robot_3dof/reference_node_3dof.py