Code duplication when installing python dependencies

[PetervdPerk-NXP]

So for my PR PX4/PX4-Autopilot#17100, I'm bringing this new python module kconfiglib, unfortunely I've lost count on which places I've had to add the dependencies.

Would it be possible that all PX4 docker containers install the python dependencies for all containers based on a single file?

[dagar]

That's definitely been the goal for some time, it just hasn't quite materialized.

I would like the PX4-Autopilot repo to be the source of truth, including locking down any particular package versions. https://github.com/PX4/PX4-Autopilot/tree/master/Tools/setup