Initial port to ROS 2#41

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ahcorde wants to merge 11 commits intofoxyfrom

ahcorde/port/ros2

Commits on Jan 14, 2021

Initial port to ROS 2
ahcorde
committed

Commits on Feb 2, 2021

Update config files with recent changes in gazebo_ros2_control
ahcorde
committed

Commits on Feb 4, 2021

Improved description
ahcorde
committed

Commits on Mar 5, 2021

load and launch the controllers
ahcorde
committed

Commits on Mar 18, 2021

Added note to notice that we should port to ROS 2 other packages
ahcorde
committed

Commits on Jun 10, 2021