Spring-ai vertex ai aot hints, plus a fix to localize the dependency on spring web flux

hi i want to use vertex ai in a graalvm native image context so i crafted these aot hints to help

also: i localized the spring-webflux dependency, as its not used in most modules.

Comment From: tzolov

Thanks @joshlong Rebased and merged at: 95cbe54bae211da8e2aee0640ae6ff3e96bada1e