add tidb on qdrant type (#9831)

Co-authored-by: Zhaofeng Miao <522856232@qq.com>

api/configs/feature/__init__.py

@@ -571,6 +571,11 @@ class DataSetConfig(BaseSettings):
         default=False,
     )
 
+    TIDB_SERVERLESS_NUMBER: PositiveInt = Field(
+        description="number of tidb serverless cluster",
+        default=500,
+    )
+
 
 class WorkspaceConfig(BaseSettings):
     """