chore: import upstream snapshot with attribution

examples/flows/evaluation/eval-classification-accuracy/flow.dag.yaml

@@ -0,0 +1,35 @@
+$schema: https://azuremlschemas.azureedge.net/promptflow/latest/Flow.schema.json
+inputs:
+  groundtruth:
+    type: string
+    description: Please specify the groundtruth column, which contains the true label
+      to the outputs that your flow produces.
+    default: APP
+  prediction:
+    type: string
+    description: Please specify the prediction column, which contains the predicted
+      outputs that your flow produces.
+    default: APP
+outputs:
+  grade:
+    type: string
+    reference: ${grade.output}
+nodes:
+- name: grade
+  type: python
+  source:
+    type: code
+    path: grade.py
+  inputs:
+    groundtruth: ${inputs.groundtruth}
+    prediction: ${inputs.prediction}
+- name: calculate_accuracy
+  type: python
+  source:
+    type: code
+    path: calculate_accuracy.py
+  inputs:
+    grades: ${grade.output}
+  aggregation: true
+environment:
+    python_requirements_txt: requirements.txt