test: restructure test packages

Signed-off-by: Steffen Vogel <post@steffenvogel.de>

pkg/util/json.go

@@ -0,0 +1,13 @@
+package util
+
+import "encoding/json"
+
+func ReIndentJSON(j []byte, prefix, indent string) ([]byte, error) {
+	u := map[string]any{}
+
+	if err := json.Unmarshal(j, &u); err != nil {
+		return nil, err
+	}
+
+	return json.MarshalIndent(u, prefix, indent)
+}