群组状态监听

fun BimImManager.addDiscussionListener(listener: BimDiscussionListener)
fun BimImManager.removeDiscussionListener(listener: BimDiscussionListener)
fun BimImManager.removeDiscussionListener(key: String)

BimDiscussionListener 提供以下状态事件：

fun onMemberEnter(discussionId: String, memberList: List<BimDiscussionMember>)
fun onMemberLeave(discussionId: String, member: BimDiscussionMember)
fun onMemberInvited(discussionId: String, opUser: BimDiscussionMember, memberList: List<BimDiscussionMember>)
fun onMemberKicked(discussionId: String, opUser: BimDiscussionMember, memberList: List<BimDiscussionMember>)
fun onDiscussionMemberMuteChanged(discussionId: String, memberList: List<BimDiscussionMember>)
fun onDiscussionCreated(discussionId: String)
fun onDiscussionDismissed(discussionId: String, opUser: BimDiscussionMember)
fun onDiscussionOwnerChanged(discussionId: String, opUser: BimDiscussionMember, newOwner: BimDiscussionMember)
fun onDiscussionProfileChanged(discussionId: String, discussion: BimDiscussion, changedFields: Collection<BimDiscussionProfileField>)
fun onAllDiscussionMembersMuted(discussionId: String, isMuted: Boolean, muteUntil: Long)
fun onQuitFromDiscussion(discussionId: String)

示例：

val listener = object : BimDiscussionListener {
    override val key = "discussion_listener"
    override fun onDiscussionProfileChanged(
        discussionId: String,
        discussion: BimDiscussion,
        changedFields: Collection<BimDiscussionProfileField>,
    ) { println("changed=$changedFields") }
}
BimImManager.getInstance().addDiscussionListener(listener)

群组 listener 只表达群状态变化，不插入消息或生成消息气泡；群消息仍通过 BimMsgListener 处理。muteUntil 为毫秒时间戳，0 表示未禁言或服务端未返回。