Introduce `MultiValueMapCollector` for use with streams#35958

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florianhof wants to merge 2 commits intospring-projects:mainfrom

florianhof:feature/spring-data-commons-3420_MultiValueMapCollector_public

Commits on Dec 3, 2025

spring-data-commons#3420 MultiValueMapCollector public
florianhof
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Commits on Dec 5, 2025

spring-data-commons#3420 MultiValueMapCollector public - fix style
florianhof
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