RQT Teleop Plugin

Changelog

• fix: Speed and step input boxes not working
• ci: Add building, testing, prek, and renovatebot
• fix: Prek workflow
• fix: Missing .hpp headers on older ROS 2 distros
• ci(nix): Temporarily remove ROS 2 rolling

I fixed a few bugs as described in the above commits and created some (more like reused previously made ones) CI workflows.
I will now do the necessary things needed in order to get this package published in the ROS 2 apt repositories for all the current ROS 2 distributions.

Changelog

• feat: Initialize repository and create basic keyboard-based teleop

I spent a lot of time deciding on the framework I wanted to use for this tool. I initially wanted this to be a simple TUI in Rust, but it was pretty hard to get keyboard input detection working properly (it was almost impossible to find a cross-platform way to detect whether a key/multiple keys were pressed at the same time).
I then decided to just use ROS’s standard RQT framework for creating GUIs.

I have created the following features right now:

• Publishes geometry_msgs/msg/TwistStamped
• Drives linear.x, linear.y, and angular.z with the keyboard
• Continuously publishes the current command at 20 Hz
• Clears held motion keys when the window loses focus
• Lists available TwistStamped topics from the ROS graph and also allows manual topic entry
• Exposes per-axis speed and per-axis speed step controls in the GUI