chore: import upstream snapshot with attribution

tests/pyfunc/sample_code/python_model.py

@@ -0,0 +1,10 @@
+from mlflow.models import set_model
+from mlflow.pyfunc import PythonModel
+
+
+class MyModel(PythonModel):
+    def predict(self, context, model_input):
+        return f"This was the input: {model_input}"
+
+
+set_model(MyModel())