external knowledge api (#8913)

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

api/fields/external_dataset_fields.py

@@ -0,0 +1,11 @@
+from flask_restful import fields
+
+from libs.helper import TimestampField
+
+external_knowledge_api_query_detail_fields = {
+    "id": fields.String,
+    "name": fields.String,
+    "setting": fields.String,
+    "created_by": fields.String,
+    "created_at": TimestampField,
+}