Add redis: Boot 4.1 + Spring Data Redis 4.1, the JDK-serialisation default vs Jackson 3 serializers, @RedisHash TTL and keyspace events, @RedisListener, and Redis as the Spring cache

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01B38FGKKam5SCGgwgduVAh3

redis/docs/output/15-cache-json.txt

@@ -0,0 +1,15 @@
+# Redis as the Spring cache with a Jackson 3 value serializer
+
+
+--- The result that was not Serializable now caches ---
+find(1) called twice, method body ran 1 time(s)
+second call returned: User[id=1, name=Ankur]
+
+--- What is in Redis ---
+$ redis-cli -p 6390 KEYS '*' | sort
+users::1
+$ redis-cli -p 6390 GET users::1
+{"@class":"com.ankurm.redis.model.User","id":1,"name":"Ankur"}
+$ redis-cli -p 6390 --no-raw TTL users::1
+(integer) 300
+spring.cache.redis.time-to-live=10m is set, and the bean says 5 minutes