Delay workaround for mpp for iOS

customDelay.kt

actual suspend fun customDelay(timeMillis: Long) {
    suspendCancellableCoroutine<Unit> { cont ->
        val ntime = dispatch_time(DISPATCH_TIME_NOW, timeMillis * NSEC_PER_MSEC.toLong())
        dispatch_after(ntime, dispatch_get_main_queue()) {
            cont.resume(Unit)
        }
    }
}