nextMessageOrNullAsync
inline fun <P : MessageEvent> P.nextMessageOrNullAsync( timeoutMillis: Long, coroutineContext: CoroutineContext = EmptyCoroutineContext, priority: EventPriority = EventPriority.MONITOR, noinline filter: suspend P.(P) -> Boolean = { true }): <ERROR CLASS><MessageChain?>
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nextMessageOrNull 的异步版本