feat: update extractor error handling to use models.UnknownRowValues for improved type consistency

cmd/go_migrate/process.go

@@ -160,7 +160,7 @@ func logSampleRow(
 	schema string,
 	table string,
 	columns []ColumnType,
-	rowValues UnknownRowValues,
+	rowValues models.UnknownRowValues,
 	tag string,
 ) {
 	log.Infof("[%s.%s] Sample row: (%s)", schema, table, tag)