Remainder review comments on Ingres Connector initial code drop

Per request when we merged https://github.com/debezium/debezium-connector-ingres/pull/3#top, here are the remaining review comments to explore and resolve

1. https://github.com/debezium/debezium-connector-ingres/pull/3#discussion_r2698537645 Here it's mentioned that there is a much larger list of options to pull from. Is there a list to reference? Informix has a couple added options, not all of them looked applicable to Ingres.
2. https://github.com/debezium/debezium-connector-ingres/pull/3#discussion_r2708073188 A question of do we need to handle RELATION records. After looking into this, yes, Ingres should be able to send them mid-transaction so that needs to be addressed.
3. https://github.com/debezium/debezium-connector-ingres/pull/3#discussion_r2708087517 asking about the cache comment. Ingres does work as Informix works, so we have to cache records until the end of the transaction.