Remove extension state machine

[aidnem]

BLOCKED ON CONFIRMATION FROM DESIGN TEAM: It seems like we're going to remove the ability for the climber to extend beyond frame perimeter. This means that we can remove the extension state machine and more directly control the intake/climber.

• Remove the extension state machine
• Add all the functionality that would control the climber directly to the commands where they're needed
• Use state variables to represent intake deploy/retract state and whether or not we're running the rollers. These can go in either coordination layer or in the intake subsystem.