Redis 8.2 Preparing More Performance Optimizations, SVS-VAMANA

Redis 8.2 release candidate introduces multiple performance optimizations including BITCOUNT prefetching, improved SCAN operations with selective expiration checks, string2ll result caching for list operations, TTL optimization for COPY/RENAME/RESTORE commands, reduced malloc overhead tracking, non-blocking client cron operations, and memory footprint improvements through number inlining.