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

member_list	NIMQChatServerGetMembersPageResp
member_list_count	NIMQChatServerGetMembersPageResp
page_info	NIMQChatServerGetMembersPageResp
res_code	NIMQChatServerGetMembersPageResp
user_data	NIMQChatServerGetMembersPageResp