feat: update go-redis to v8, support ctx in redis methods (#1507)

* feat: update go-redis to v8, support ctx in redis methods

* fix compile errors

* chore: remove unused const

* chore: add tracing log on redis

core/limit/periodlimit_test.go

@@ -23,10 +23,9 @@ func TestPeriodLimit_RedisUnavailable(t *testing.T) {
 
 	const (
 		seconds = 1
-		total   = 100
 		quota   = 5
 	)
-	l := NewPeriodLimit(seconds, quota, redis.NewRedis(s.Addr(), redis.NodeType), "periodlimit")
+	l := NewPeriodLimit(seconds, quota, redis.New(s.Addr()), "periodlimit")
 	s.Close()
 	val, err := l.Take("first")
 	assert.NotNil(t, err)