(wip) create new driver for KeyDB

* move GC and prometheus aware storage functions to separate interfaces

storage/memory/storage_test.go

@@ -2,19 +2,13 @@ package memory
 
 import (
 	"testing"
-	"time"
 
 	"github.com/sot-tech/mochi/storage"
 	"github.com/sot-tech/mochi/storage/test"
 )
 
 func createNew() storage.PeerStorage {
-	ps, err := NewPeerStorage(Config{
-		ShardCount:                  1024,
-		GarbageCollectionInterval:   10 * time.Minute,
-		PrometheusReportingInterval: 10 * time.Minute,
-		PeerLifetime:                30 * time.Minute,
-	})
+	ps, err := NewPeerStorage(Config{ShardCount: 1024})
 	if err != nil {
 		panic(err)
 	}