toForwardMessage
fun Iterable<MessageEvent>.toForwardMessage(displayStrategy: ForwardMessage.DisplayStrategy = DisplayStrategy): ForwardMessage
fun Message.toForwardMessage(sender: User, time: Int = currentTimeSeconds().toInt(), displayStrategy: ForwardMessage.DisplayStrategy = DisplayStrategy): ForwardMessage
fun Message.toForwardMessage(senderId: Long, senderName: String, time: Int = currentTimeSeconds().toInt(), displayStrategy: ForwardMessage.DisplayStrategy = DisplayStrategy): ForwardMessage
转换为 ForwardMessage