Add safety feature for if encoder gets disconnected

[ProfessorAtomicManiac]

Right before Calgames 2023, the arm broke because the encoder got disconnected and the arm moved wildly. If the encoder is disconnected, there should be no voltage supplied to the motor.

In RobotCode2023, this is how it was implemented:
https://github.com/DeepBlueRobotics/RobotCode2023/blob/780bfeb5a3037553a4a0fd9319b45b0c33d8f15f/src/main/java/org/carlmontrobotics/robotcode2023/subsystems/Arm.java#L106-L169

Basically, we detect when an encoder is disconnected when there is no encoder "noise". When an encoder is connected, it will output a variety of values. When its disconnected, it will output the same exact value. We detect when there are no other values being outputted and after a set period of time will disable the motor.

[stwiggy]

fixed in f04cb46 and e5f7182

[ProfessorAtomicManiac]

whenever you have time, test the code by hooking up a motor to the practice board and see if it stops. Overall, it looks pretty good.