Get rid of dataSource.writeAndRead

Code clean work for getting rid of dataSource.writeAndRead.
As the discussion in https://github.com/apache/spark/pull/16481 and https://github.com/apache/spark/pull/18975#discussion_r155454606
Currently the BaseRelation returned by `dataSource.writeAndRead` only used in `CreateDataSourceTableAsSelect`, planForWriting and writeAndRead has some common code paths.