refactor: 去掉无用代码

backend/src/main/java/io/dataease/controller/sys/base/BaseGridRequest.java

 package io.dataease.controller.sys.base;
 
 import io.dataease.base.mapper.ext.query.GridExample;
-import lombok.Data;
 import org.apache.commons.collections.CollectionUtils;
 
 import java.io.Serializable;

backend/src/main/java/io/dataease/service/dataset/DataSetTableTaskService.java

 package io.dataease.service.dataset;
 
-import com.google.gson.Gson;
 import io.dataease.base.domain.*;
 import io.dataease.base.mapper.DatasetTableMapper;
 import io.dataease.base.mapper.DatasetTableTaskMapper;