Add docs for swerve and mecanum trajectory tracking

[prateekma]

The current Ramsete tutorial is great but only applies to differential drive robots. A similar comprehensive tutorial should exist for using the SwerveControllerCommand and MecanumControllerCommand classes.

[ItayZiv]

Would something like this also include actually controlling something like swerve, so like how to work with the ModuleStates (if so, in a way like the examples do with each module having a SwerveModule class that would also be included in doc).
Also, would this be best put as a full tutorial or should stuff like generating trajectories be moved to a tutorial of itself, since its the same between all 3, except for some constraints possibly

[Starlight220]

wouldn't this be covered in the state-space docs PR?

[prateekma]

No

[Daltz333]

Associate with an allwpilib example project.