LogicalPlan should have table description for persistent storage

In Tajo, all query results are finally stored into a persistent storage. So, logical planners and its related codes frequently use persistent storage information like TableDesc. But, there basically is no information in LogicalPlan. We should instantly use PlannerUtil.getTableDesc or PlannerUtil.getStoreType to get persistent storage information. If LogicalPlan has this information, the code would be simpler.