[Agora] user management

The room management class manages the list of users in the room

• Through the bottom layer OnUserListChanged Let room management manage .
• What comes up at the bottom is a user list class MapOnlineUsersType
• Give Way OnUserListChanged Method to add or delete .

void EduClassroomManager::OnUserListChanged(
    const rte::MapOnlineUsersType& users, bool add) { 
    
  API_LOGGER_CALLBACK(OnUserListChanged,