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

cb	NIMQChatDeleteMessageParam
id_info	NIMQChatDeleteMessageParam
msg_server_id	NIMQChatDeleteMessageParam
timestamp	NIMQChatDeleteMessageParam
update_info	NIMQChatDeleteMessageParam
user_data	NIMQChatDeleteMessageParam