Spring-ai Add observability support for the existing Vector Stores

Related to https://github.com/spring-projects/spring-ai/issues/1243

Comment From: tzolov

Thanks for the suggestions @ThomasVitale Hopefully last commit address them all.

Comment From: ThomasVitale

@tzolov super! It's so great to get observability instrumentation for all vector stores!

Comment From: markpollack

merged in 93fa2bf45ad37d0455b3f0d3a11b211f839f454f