lot of new functionalities

core/utils/storage/kv.go

@@ -0,0 +1,20 @@
+package storage
+
+import (
+	"time"
+
+	"github.com/spf13/viper"
+)
+
+type KVHandler interface {
+	Put(k string, v any) error
+	PutWithTTL(k string, v any, duration time.Duration) error
+	Get(k string) (any, error)
+	Delete(k string) error
+}
+
+func NewKVHandler(cfg *viper.Viper) (KVHandler, error) {
+	return NewEtcdHandler(cfg)
+	return nil, nil
+
+}