Implementation for #23254

A simple method for converting lists in an iterative way. Considered to get converter outside of the loop but getConverter method uses a cache mechanism and fetches from a HashMap this means. it's already O(1).

Comment From: pivotal-issuemaster

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Comment From: snicoll

Thanks for the PR but we've decided not to pursue with this change, see https://github.com/spring-projects/spring-framework/issues/23254#issuecomment-970273051