Migration to ROS2

[woensug-choi]

Thanks a lot for all your explanations and advice, I've finally found why the ray version wasn't working. I was using the wrong velodyne_simulator (not the official one). Everything is working fine now!
By the way, I have migrated your sonar plugin to ROS2 (galactic). If you're interested, I can open a PR on a new branch dedicated to ROS2?

Originally posted by @estellearrc in #42 (comment)

[woensug-choi]

YES! There was also someone who asked me about any plans for migration to ROS2.

May I ask you to give me some notes on ROS2 supported version? Any compatibility issues with the parent Dave repo?

[estellearrc]

I've migrated it to ROS2 galactic. For the compatibility issues, nothing to report except for the CUDA Toolkit library and its driver, one has to be careful on the choice of the version according to his/her material architecture as explained here. But I've written everything in the README.

On which branch can I open the PR?

[woensug-choi]

@estellearrc Can't you make a new branch for your PR?