Support CacheManager.resetCaches() optimization #3290
Description
We should add dedicated support for cache resets along with optimizations when using Redis. When using Redis solely for Caching (i.e. no sharing of the Redis database for non-cache operations), we could introduce functionality to issue FLUSHDB ASYNC instead of clearing each known cache individually. Pruning an entire database is a rather broad action so it should be provided only as opt-in variant to optimize within certain scenarios.