SpringBoot Extract Flyway properties mapping into separate public API class

See https://github.com/spring-projects/spring-boot/issues/32849

Decide if we want to use the property mapping logic into a separate public API class.

Comment From: bbulgarelli

Hello, is this issue still available?

Comment From: philwebb

Thanks for the offer @bbulgarelli, but I think we might need some design work on our side first. I've labeled the issue as pending-design-work. We'll remove the label once we've decided on a direction to take.