add WaitUntilAction

[AbeetoChanito]

Add the WaitUntilAction, which blocks until a certain condition is met.

Example use case:

public Action actionShoot(double delay) {
    return new SequentialAction(
            new InstantAction(() -> intake.in()),
            new InstantAction(() -> outtake.enable()),
            new WaitUntilAction(() -> outtake.inTolerance()), // <- here
            new InstantAction(() -> intake.openGate()),
            new SleepAction(delay),
            new InstantAction(() -> intake.closeGate()),
            new InstantAction(() -> intake.store()),
            new InstantAction(() -> outtake.disable())
    );
}

This code waits for the flywheel to reach full velocity before opening the gate.