Feat: Add StringTransform operator #3221 (#8520)

### What problem does this PR solve?

Feat: Add StringTransform operator #3221

### Type of change


- [x] New Feature (non-breaking change which adds functionality)

web/src/pages/agent/form-sheet/use-form-config-map.tsx

@@ -33,6 +33,7 @@ import QWeatherForm from '../form/qweather-form';
 import RelevantForm from '../form/relevant-form';
 import RetrievalForm from '../form/retrieval-form/next';
 import RewriteQuestionForm from '../form/rewrite-question-form';
+import { StringTransformForm } from '../form/string-transform-form';
 import SwitchForm from '../form/switch-form';
 import TavilyForm from '../form/tavily-form';
 import TemplateForm from '../form/template-form';
@@ -388,6 +389,11 @@ export function useFormConfigMap() {
       defaultValues: {},
       schema: z.object({}),
     },
+    [Operator.StringTransform]: {
+      component: StringTransformForm,
+      defaultValues: {},
+      schema: z.object({}),
+    },
   };
 
   return FormConfigMap;