external knowledge api (#8913)

Co-authored-by: Yi <yxiaoisme@gmail.com>

web/app/components/datasets/external-knowledge-base/create/declarations.ts

@@ -0,0 +1,12 @@
+export type CreateKnowledgeBaseReq = {
+  name: string
+  description?: string
+  external_knowledge_api_id: string
+  provider: 'external'
+  external_knowledge_id: string
+  external_retrieval_model: {
+    top_k: number
+    score_threshold: number
+    score_threshold_enabled: boolean
+  }
+}