Function devices::bat::command_monitor

fn command_monitor(
    tube: Tube,
    irq_evt: IrqLevelEvent,
    kill_evt: Event,
    state: Arc<Mutex<GoldfishBatteryState>>,
    create_power_monitor: Option<Box<dyn CreatePowerMonitorFn>>,
    battery_config: Arc<Mutex<BatConfig>>
)