override toString for UnknownField for clearer RecordSimilarityResponse object

Author: Grace Calianese

model/src/main/java/com/basistech/rosette/apimodel/recordsimilarity/records/UnknownField.java

@@ -37,6 +37,11 @@ public UnknownField(JsonNode data) {
         this.data = data;
     }
 
+    @Override
+    public String toString() {
+        return String.valueOf(this.data);
+    }
+
     @JsonValue
     public Object getData() {
         if (data == null) {