初步实验使用KV数据库（pebble）存储缓存索引

internal/utils/kvstore/logger.go

@@ -0,0 +1,17 @@
+// Copyright 2024 GoEdge CDN goedge.cdn@gmail.com. All rights reserved. Official site: https://goedge.cn .
+
+package kvstore
+
+type Logger struct {
+}
+
+func NewLogger() *Logger {
+	return &Logger{}
+}
+
+func (this *Logger) Infof(format string, args ...any) {
+
+}
+func (this *Logger) Fatalf(format string, args ...any) {
+
+}