Freight: rename CarrierControler... to CarrierController...

[kt86]

..., rename package accordingly, and change usage of the (core) Controler to (core) Controller.

Also run "optimize imports" on the freight contrib.

[kt86]

With this PR, we will fix the spelling error of controler in the freight contrib.
In contrast to the changes in core (see #3511), we do not provide the option for the controller with 'll'. We directly changed it. This avoids another step somewhere in the future and having both options flying around for the time being.
So in the end, this will be code-braking, at least due to the renaming of the package.
So please be aware of it @JWJoubert, @tschlenther