NIMQChatServerMarkReadParam 成员列表

成员的完整列表，这些成员属于 NIMQChatServerMarkReadParam,包括所有继承而来的类成员

cb	NIMQChatServerMarkReadParam
server_ids	NIMQChatServerMarkReadParam
server_ids_count	NIMQChatServerMarkReadParam
user_data	NIMQChatServerMarkReadParam