Feat: Display the knowledge graph on the knowledge base page #4543 (#4587)

### What problem does this PR solve?

Feat: Display the knowledge graph on the knowledge base page #4543

### Type of change


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

web/src/services/knowledge-service.ts

@@ -165,4 +165,8 @@ export const renameTag = (
   { fromTag, toTag }: IRenameTag,
 ) => post(api.renameTag(knowledgeId), { fromTag, toTag });
 
+export function getKnowledgeGraph(knowledgeId: string) {
+  return request.get(api.getKnowledgeGraph(knowledgeId));
+}
+
 export default kbService;