Create a Turret Subsystem

[Rain-Alderson]

Create a new subsystem in the code that is responsible for aiming a turret.

The new subsystem should include a single motor and encoder. These will control the direction of the turret's aim. The motor and encoder should be used together with the Camera's detected goal position to aim at the goal. The current implementation for aiming can be used for reference: DriveSubsystem (See the aim PID controller and its uses).

The CameraAim command should also be updated to aim with the new TurretSubsystem instead of using the DriveSubsystem.

Please post discussion about the turret subsystem here, or any updates that may occur.