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_sentinel_store.go

@@ -26,10 +26,11 @@ func (store *RedisLuaSentinelStore) Initialize(configuration util.Configuration,
 		configuration.GetString(prefix+"username"),
 		configuration.GetString(prefix+"password"),
 		configuration.GetInt(prefix+"database"),
+		configuration.GetString(prefix+"keyPrefix"),
 	)
 }
 
-func (store *RedisLuaSentinelStore) initialize(addresses []string, masterName string, username string, password string, database int) (err error) {
+func (store *RedisLuaSentinelStore) initialize(addresses []string, masterName string, username string, password string, database int, keyPrefix string) (err error) {
 	store.Client = redis.NewFailoverClient(&redis.FailoverOptions{
 		MasterName:      masterName,
 		SentinelAddrs:   addresses,
@@ -41,5 +42,6 @@ func (store *RedisLuaSentinelStore) initialize(addresses []string, masterName st
 		ReadTimeout:     time.Second * 30,
 		WriteTimeout:    time.Second * 5,
 	})
+	store.keyPrefix = keyPrefix
 	return
 }