NIMQChatChannelGetMembersPageParam 成员列表

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

cb	NIMQChatChannelGetMembersPageParam
channel_id	NIMQChatChannelGetMembersPageParam
limit	NIMQChatChannelGetMembersPageParam
server_id	NIMQChatChannelGetMembersPageParam
timestamp	NIMQChatChannelGetMembersPageParam
user_data	NIMQChatChannelGetMembersPageParam