feat: add stub implementation for image

QRCodeFromEntity

fix: base64 StubQRCodeGenerator

config/services.yaml

@@ -27,8 +27,13 @@ services:
         arguments:
             $available_currencies: '%app.currencies%'
 
+    App\Service\StubQRCodeGenerator:
+        arguments:
+            $imagePath: '%kernel.project_dir%/assets/images/wip.png'
+
     App\Service\CurrencyListerInterface: '@App\Service\StaticCurrencyLister'
     App\Service\QRCodeQROptionsProviderInterface: '@App\Service\QRCodeQROptionsDefaultProvider'
+    App\Service\QRCodeGeneratorInterface: '@App\Service\StubQRCodeGenerator'
 
     # add more service definitions when explicit configuration is needed
     # please note that last definitions always *replace* previous ones