[mock] migrate components to ROS2

[stonier]

Mock

• Dynamic reconfigure Dashboard → #8, #9
• Mock Dashboard → #8
• Launcher → #8
• Battery → #8
• LED Strip
• Fake Action Server → #10
• Action Server (ros2/rclpy#257, ros2/rclpy#270))
• Dock → #10
• Move Base → #11
• Rotate → #10
• Safety Sensors → #9

[stonier]

Still pending the arrival of the actual action server/client. Tracking that in #12 and closing this one out.