RecordUpdater should read virtual columns from row

Currently RecordUpdater.update and delete take rowid and original transaction as parameters. These values are already present in the row as part of the new ROW_ID virtual column in HIVE-7513, and thus can be read by the writer from there. And the writer will already have to handle skipping ROW_ID when writing, so it needs to be aware of that column anyone.

We could instead read the values from ROW__ID and then remove it from the object inspector in FileSinkOperator, but this will be hard in the vectorization case where rows are being dealt with 10k at a time.

For these reasons it makes more sense to do this work in the writer.