vehicle setup: advanced ArduSub lights configuration

Can we add a slider for the steps?
And min/max PWM limits?

Could also be nice to have a little graph showing the steps visually (with display options for both linear and Lumen-exponential brightness outputs).

It might make sense to have the channel controls in the top row, and then the steps slider + graph in a second row (instead of the current approach with everything in a single row).

Thinking something like this:

_Originally posted by @ES-Alexander in https://github.com/bluerobotics/BlueOS/issues/2368#issuecomment-1930744278_