feat: add question_id field in ReviewDocumentOperationMetadata (#269)

* feat: add question_id field in ReviewDocumentOperationMetadata

PiperOrigin-RevId: 424949086

Source-Link: googleapis/googleapis@087bceb

Source-Link: googleapis/googleapis-gen@af34793
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packages/google-cloud-documentai/google/cloud/documentai_v1/types/document_processor_service.py

@@ -274,11 +274,14 @@ class ReviewDocumentOperationMetadata(proto.Message):
         common_metadata (google.cloud.documentai_v1.types.CommonOperationMetadata):
             The basic metadata of the long running
             operation.
+        question_id (str):
+            The question ID.
     """
 
     common_metadata = proto.Field(
         proto.MESSAGE, number=5, message=operation_metadata.CommonOperationMetadata,
     )
+    question_id = proto.Field(proto.STRING, number=6,)
 
 
 __all__ = tuple(sorted(__protobuf__.manifest))