Spring Improve method validation support for errors on elements within a container

Expands on the validation behaviour added as part of the work for https://github.com/spring-projects/spring-framework/issues/30645, motivated by an issue with Sets containing an object with nested Lists, introduced in https://github.com/spring-projects/spring-framework/issues/29825. The adapter should now better handle nested objects for types beyond those of List or Map.

Comment From: rstoyanchev

For additional context, see https://github.com/spring-projects/spring-framework/issues/30645#issuecomment-1783969150. In short, currently we support List and Map containers. The goal is to also support arrays and sets, and other container types for which there is a registered Jakarta ValueExtractor.

Comment From: rstoyanchev

Thanks for the report and changes. Element container handling is not only improved but also simpler.