code: public static AVIMConversationMemberInfo createInstance(Map<String, Object> data) {
      if (null == data) {
        return null;
      }
      String conversationId = (String)data.get(ATTR_CONVID);
      String memberId = (String)data.get(ATTR_MEMBERID);
      String roleStr = (String)data.get(ATTR_ROLE);
      String objectId = (String)data.get(ATTR_OJBECTID);
      ConversationMemberRole role = ConversationMemberRole.fromString(roleStr);
      return new AVIMConversationMemberInfo(objectId, conversationId, memberId, role);
    }
docs: 根据服务端返回信息创建实例（内部使用）
  @param data
  @return