Arm subsystem

[weizhang-2706]

We know the arm is a single pivot arm with an absolute encoder on it. The arm will have 1 (maybe 2) motors, most likely Neo motors with Spark max motor controllers. The arm will function similarly to the bottom arm pivot from the 2023-2706-Robot-Code. There are no pneumatics for the arm this year. There will be a spring installed on the robot to help with the force required to raise the arm.

The following is the deliverable for this ticket:

• creating the ArmSubsystem.java
• creating the arm command
• binding three buttons such that when button a is pressed, the arm moves into position to score in the amp, when button b is pressed, the arm moves into position to score in the speaker, and when button c is pressed, the arm moves down into position to intake

[emilycxliu]

Referring to Fall's poseidon bottom arm code.