APIv4 - Add more metadata to CustomValue entities; use AutoService

APIv4 - Add more metadata to CustomValue entities; use AutoService

There are several places in SearchKit code that check an entity 'type' to see if it contains 'DAOEntity'; they all seem designed
to test if the query will go through  (so does it support joins, etc?) and custom entities were getting overlooked.

While I was at it I switch to our new standard 'AutoService' style of event listener