Polishing.

Replace blocking lock wait with non-blocking flow. Add support for asynchronous storage to persist the cache value after retrieval from the value supplier. Introduce AsyncCacheWriter abstraction to improve functional guards.

Reformat code. Remove redundant tests. Revisit deprecation notices with consistent mention of the version in which the deprecation was introduced.

Refine exception messages when RedisCache does not support async retrieval.

See spring-projects#2650
Original pull request: spring-projects#2717

Author: mp911de

Diff for: src/main/java/org/springframework/data/redis/aot/RedisRuntimeHints.java

@@ -106,6 +106,7 @@ public void registerHints(RuntimeHints hints, @Nullable ClassLoader classLoader)
 						TypeReference.of(ReactiveClusterScriptingCommands.class),
 						TypeReference.of(ReactiveClusterGeoCommands.class),
 						TypeReference.of(ReactiveClusterHyperLogLogCommands.class), TypeReference.of(ReactiveRedisOperations.class),
+						TypeReference.of(ReactiveRedisConnectionFactory.class),
 						TypeReference.of(ReactiveRedisTemplate.class), TypeReference.of(RedisOperations.class),
 						TypeReference.of(RedisTemplate.class), TypeReference.of(StringRedisTemplate.class),
 						TypeReference.of(KeyspaceConfiguration.class), TypeReference.of(MappingConfiguration.class),