Refactor gates creating service, repository and tests

src/models/__init__.py

@@ -0,0 +1,12 @@
+from .credential import Credential
+from .gate import Gate
+from .status import Status
+from .users import Users, Role
+
+__all__ = [
+    "Credential",
+    "Gate",
+    "Status",
+    "Users",
+    "Role"
+]