improve: introduce isort for linting Python imports (#1983)

api/core/features/annotation_reply.py

@@ -1,16 +1,15 @@
 import logging
 from typing import Optional
 
-from flask import current_app
-
 from core.embedding.cached_embedding import CacheEmbedding
 from core.entities.application_entities import InvokeFrom
 from core.index.vector_index.vector_index import VectorIndex
 from core.model_manager import ModelManager
 from core.model_runtime.entities.model_entities import ModelType
 from extensions.ext_database import db
+from flask import current_app
 from models.dataset import Dataset
-from models.model import App, Message, AppAnnotationSetting, MessageAnnotation
+from models.model import App, AppAnnotationSetting, Message, MessageAnnotation
 from services.annotation_service import AppAnnotationService
 from services.dataset_service import DatasetCollectionBindingService