Add support for ros2 control #544
Description
A commonly-used toolkit in ROS is ros2_control, which includes a standard way of interfacing with hardware, building control loops, and hotswapping them on live robots. It's quite useful for prototyping and has become the standard way for a lot of manufacturers to provide an interface.
It would be useful to add support for building and running these controllers in rules_ros2.
I have some changes prepared. If this is useful, I'll open a PR once I get the changes working.