Feat: Add the iteration Node #4242 (#4247)

### What problem does this PR solve?

Feat: Add the iteration Node #4242

### Type of change


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

web/src/pages/flow/interface.ts

@@ -90,7 +90,7 @@ export interface ISwitchForm {
 export type NodeData = {
   label: string; // operator type
   name: string; // operator name
-  color: string;
+  color?: string;
   form:
     | IBeginForm
     | IRetrievalForm