cn isAdd 为 true 时, 会将 account 确定这么设置（黑名单，静音） 如果一个用户被加入了黑名单, 那么就不再会收到此用户发送的消息
isAdd 为 false 时, 会将 account 取消设置 如果一个用户被从黑名单移除, 那么可以收到此用户发送的消息
en When isAdd is set to true, the account will be added to the blocklist or list of muted members. If a user is added to the blacklist, you will no longer receive messages from this user.
When isAdd is false, the account will be removed from the blacklist or mute list. If a user is removed from the blacklist, you can receive messages from this user.
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