split utils, separate IRVE guess

mappings/mapping-config.type.ts

@@ -77,6 +77,7 @@ export interface FeaturePropertyMappingConfigType {
     truncate_enums_to_limit?: number,
     conditional_values?: ConditionnalValuesConfigType,
     transform_function?: Function,
+    keep_only_max_in_enum?:boolean,
 
     [key: string]: any,
 }