feat: add Wikipedia operator #918 (#1516)

### What problem does this PR solve?

Add Wikipedia operator #918 

### Type of change


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

web/src/pages/flow/hooks.ts

@@ -41,6 +41,7 @@ import {
   initialRelevantValues,
   initialRetrievalValues,
   initialRewriteQuestionValues,
+  initialWikipediaValues,
 } from './constant';
 import { ICategorizeForm, IRelevantForm } from './interface';
 import useGraphStore, { RFState } from './store';
@@ -88,6 +89,7 @@ export const useInitializeOperatorParams = () => {
       },
       [Operator.DuckDuckGo]: initialDuckValues,
       [Operator.Baidu]: initialBaiduValues,
+      [Operator.Wikipedia]: initialWikipediaValues,
     };
   }, [llmId]);