filer: add username and keyPrefix support for Redis stores (#7591)

* filer: add username and keyPrefix support for Redis stores

Addresses https://github.com/seaweedfs/seaweedfs/issues/7299

- Add username config option to redis2, redis_cluster2, redis_lua, and
  redis_lua_cluster stores (sentinel stores already had it)
- Add keyPrefix config option to all Redis stores to prefix all keys,
  useful for Envoy Redis Proxy or multi-tenant Redis setups

* refactor: reduce duplication in redis.NewClient creation

Address code review feedback by defining redis.Options once and
conditionally setting TLSConfig instead of duplicating the entire
NewClient call.

* filer.toml: add username and keyPrefix to redis2.tmp example

weed/filer/redis_lua/redis_cluster_store.go

@@ -25,20 +25,24 @@ func (store *RedisLuaClusterStore) Initialize(configuration util.Configuration,
 
 	return store.initialize(
 		configuration.GetStringSlice(prefix+"addresses"),
+		configuration.GetString(prefix+"username"),
 		configuration.GetString(prefix+"password"),
+		configuration.GetString(prefix+"keyPrefix"),
 		configuration.GetBool(prefix+"useReadOnly"),
 		configuration.GetBool(prefix+"routeByLatency"),
 		configuration.GetStringSlice(prefix+"superLargeDirectories"),
 	)
 }
 
-func (store *RedisLuaClusterStore) initialize(addresses []string, password string, readOnly, routeByLatency bool, superLargeDirectories []string) (err error) {
+func (store *RedisLuaClusterStore) initialize(addresses []string, username string, password string, keyPrefix string, readOnly, routeByLatency bool, superLargeDirectories []string) (err error) {
 	store.Client = redis.NewClusterClient(&redis.ClusterOptions{
 		Addrs:          addresses,
+		Username:       username,
 		Password:       password,
 		ReadOnly:       readOnly,
 		RouteByLatency: routeByLatency,
 	})
+	store.keyPrefix = keyPrefix
 	store.loadSuperLargeDirectories(superLargeDirectories)
 	return
 }