DiskANN v0.59.0

This change is backwards compatible with 0.58.0 outside of the following breaking changes to diskann-disk:

• Public function diskann_disk::search::pq::quantizer_preprocess removed. It has been removed and its logic folded into a private PQScratch::prepare_query/preprocess_query method as part of migrating disk PQ flat scan onto the new flat-scan API (#1341).

What's Changed

• Migrate disk PQ flat scan to flat API by juchen-ms (@partychen) in #1341
• Bump the github-actions group across 1 directory with 3 updates by Dependabot (@dependabot)[bot] in #1371
• [diskann-garnet] Implement continue_search() by Jack Moffitt (@metajack) in #1357
• [diskann-wide] Add more 64-bit neon types by Mark Hildebrand (@hildebrandmw) in #1377
• Allow access to the inner accessor in BetaAccessor. by Mark Hildebrand (@hildebrandmw) in #1391
• [multi vector] Distance Kernels by Mark Hildebrand (@hildebrandmw) in #1368

Full Changelog: v0.58.0...v0.59.0