async

fun <T> Lifetime.async(    context: CoroutineContext = EmptyCoroutineContext,     start: CoroutineStart = CoroutineStart.DEFAULT,     block: suspend CoroutineScope.() -> T): Deferred<T>
fun <T> Lifetime.async(    scheduler: IScheduler,     start: CoroutineStart = CoroutineStart.DEFAULT,     block: suspend CoroutineScope.() -> T): Deferred<T>