refactor: move hrp/ to root folder

internal/json/json.go

@@ -0,0 +1,17 @@
+package json
+
+import (
+	jsoniter "github.com/json-iterator/go"
+)
+
+// replace with third-party json library to improve performance
+var json = jsoniter.ConfigCompatibleWithStandardLibrary
+
+var (
+	Marshal       = json.Marshal
+	MarshalIndent = json.MarshalIndent
+	Unmarshal     = json.Unmarshal
+	NewDecoder    = json.NewDecoder
+	NewEncoder    = json.NewEncoder
+	Get           = json.Get
+)