feat: [bigquery-datapolicies] support using custom UDF in the data po…

…licy (#4582)

* feat: support using custom UDF in the data policy

PiperOrigin-RevId: 559480224

Source-Link: googleapis/googleapis@4ffd6cd

Source-Link: googleapis/googleapis-gen@2fa3b74
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packages/google-cloud-bigquery-datapolicies/protos/google/cloud/bigquery/datapolicies/v1/datapolicy.proto

@@ -359,5 +359,10 @@ message DataMaskingPolicy {
   oneof masking_expression {
     // A predefined masking expression.
     PredefinedExpression predefined_expression = 1;
+
+    // The name of the BigQuery routine that contains the custom masking
+    // routine, in the format of
+    // `projects/{project_number}/datasets/{dataset_id}/routines/{routine_id}`.
+    string routine = 3;
   }
 }