MecanumDriveWheelVoltages is only in Java

[KangarooKoala]

Describe the bug Java has a MecanumDriveWheelVoltages class and C++ does not. In wpilib, the only place MecanumDriveWheelVoltages is used is in MecanumControllerCommand, where it is used as a parameter type to the callback to set the motor voltages (Consumer<MecanumDriveWheelVoltages>). The C++ version instead uses 4 separate parameters for the callback (std::function<void(units::volt_t, units::volt_t, units::volt_t, units::volt_t)>).

Expected behavior C++ and Java either both have or both don't have MecanumDriveWheelVoltages, and their MecanumControllerCommand APIs are similar.

[PeterJohnson]

If it's only in that one place, we could replace the Supplier with a @FunctionalInterface that takes the 4 parameters, just like C++.

[KangarooKoala]

Although it would be fairly easy to migrate, I don't think it would be good to introduce a breaking change like this one so close to kickoff (1 month left, with winter break for most schools in between). Maybe a 2025 goal? (Or maybe there is still enough time for this since it's so simple?)