Split covariance_insertion_node Node class
requested to merge ambroise.vincent/AutowareAuto:363-verify-all-non-trivial-nodes-implement-3-tier-design-pattern-5 into master
Create a new covariance_insertion package to host the "core" class, leaving the "ROS Node" class in the covariance_insertion_node package.
The resulting Core class is not very big. It only handles the covariance map.
Part of #363 (closed)