Adds support for Redis 8.4 features

• support multi-string-set with expiration MSETEX ...; details controlled via new Expiration API
• support checked string-set SET ... IFEQ/IFNE/IFDEQ/IFDNE digestOrValue; details controlled via new ValueCondition API; also uses Expiration for expiry
• support checked string-delete DELEX ... IFEQ/IFNE/IFDEQ/IFDNE digestOrValue (again via ValueCondition)
• use checked string-set/delete to implement LockExtend[Async]/LockRelease[Async] when possible
• support XREADGROUP ... CLAIM minIdleTime for simplified stream processing

Note that niche StringSet[Async] scenarios may require trivial build changes due to removing default parameter values; this simplify means explicitly specifying keepTtl, or using the new Expiration API. There is no impact to already compiled code (no methods have been removed).

8.4 also includes "hybrid search"; this is not currently exposed in SE.Redis, and will be added to NRedisStack ASAP.