Investigate native code for bbq bulk scoring

[benwtrent]

Description

With IVF, its possible to have a whole large section of a file to be scored at a time. Requiring only a single down call to native code to then score multiple vectors at once. This might make the pay-offs for native code worth it.

This work would require new native work within org.elasticsearch.nativeaccess.jdk and the native path in simdvec.

It might prove difficult pulling it through to the MemorySegmentES91OSQVectorsScorer but scoring postings is a dominating cost in IVF, and so making that faster is nicer :)

[elasticsearchmachine]

Pinging @elastic/es-search-relevance (Team:Search Relevance)