成员的完整列表，这些成员属于 com.netease.nimlib.sdk.chatroom.model.ChatRoomMessageExtension,包括所有继承而来的类成员

getRoleInfoTimeTag()	com.netease.nimlib.sdk.chatroom.model.ChatRoomMessageExtension
getSenderAvatar()	com.netease.nimlib.sdk.chatroom.model.ChatRoomMessageExtension
getSenderExtension()	com.netease.nimlib.sdk.chatroom.model.ChatRoomMessageExtension
getSenderNick()	com.netease.nimlib.sdk.chatroom.model.ChatRoomMessageExtension
setRoleInfoTimeTag(long roleInfoTimeTag)	com.netease.nimlib.sdk.chatroom.model.ChatRoomMessageExtension
setSenderAvatar(String avatar)	com.netease.nimlib.sdk.chatroom.model.ChatRoomMessageExtension
setSenderExtension(Map< String, Object > extension)	com.netease.nimlib.sdk.chatroom.model.ChatRoomMessageExtension
setSenderNick(String nick)	com.netease.nimlib.sdk.chatroom.model.ChatRoomMessageExtension