The Debezium Postgres connector now just supports the notion of blacklisting column names. For some usecases it's beneficial to introduce a whitelist for columns. Therefore this the proposal is to introduce the `column.whitelist` for the Postgres connector. It's similar to the whitelist already in use for tables, which also inverses the behaviour of the blacklist for tables.

Checked before implementation with gunnar.morling if this would be a useful addition to Debezium.