NIMQChatChannelMemberSearchParam 成员列表

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

cb	NIMQChatChannelMemberSearchParam
channel_id	NIMQChatChannelMemberSearchParam
keyword	NIMQChatChannelMemberSearchParam
limit	NIMQChatChannelMemberSearchParam
server_id	NIMQChatChannelMemberSearchParam
user_data	NIMQChatChannelMemberSearchParam