NIMQChatMemberInfo 成员列表

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

accid	NIMQChatMemberInfo
avatar	NIMQChatMemberInfo
channel_id	NIMQChatMemberInfo
create_time	NIMQChatMemberInfo
custom	NIMQChatMemberInfo
inviter	NIMQChatMemberInfo
join_time	NIMQChatMemberInfo
nick	NIMQChatMemberInfo
server_id	NIMQChatMemberInfo
type	NIMQChatMemberInfo
update_time	NIMQChatMemberInfo
valid_flag	NIMQChatMemberInfo