[fix] Allow api usage with dot access from wallet_google namespace

src/edutap/wallet_google/__init__.py

@@ -1,2 +1,4 @@
-# import to register models
+# import to enable direkt usage import from parent namespace
+# models also registers the models in the registry
+from . import api  # noqa: F401
 from . import models  # noqa: F401