Enhancement: Support redis hashes with field expiration for namespaced `RedisStore`s on redis 7.4+

Summary

Redis 7.4 introduced field expiration for hashes. This allows us to more easily implement namespaced stores for redis, also giving a big performance improvement for bulk deletions (because the hash key can simply be deleted instead of iterating over every individual key in the namespace).

This feature should be opt-in, possibly with a None default, detecting the redis version on startup and using the optimal strategy.

On redis 8+, HGETEX can be used for "get and renew" actions