fix(renderer): export validator mapper in index.js

Author: Hyperkid123

packages/react-form-renderer/src/index.js

@@ -15,3 +15,4 @@ export { default as useFieldApi } from './files/use-field-api';
 export { default as DefaultSchemaError } from './files/schema-errors';
 export { default as WizardContext } from './files/wizard-context';
 export { default as parseCondition } from './files/parse-condition';
+export { default as validatorMapper } from './files/validator-mapper';