Function run_coordinator 

async fn run_coordinator<T, S>(
    coord: Coordinator<T, S>,
    external_rx: UnboundedReceiver<OpaqueMessage<T::SignatureKey>>,
    tx: Sender<CoordinatorEvent<T>>,
    queue_len: Option<Arc<dyn Gauge>>,
    shutdown: CancellationToken,
    exited: CancellationToken,
    resting: Arc<RwLock<Resting<T>>>,
)
where
    T: NodeType,
    S: NewProtocolStorage<T>,