Refactor/message cycle manage and knowledge retrieval (#20460)

Signed-off-by: -LAN- <laipz8200@outlook.com>

api/core/callback_handler/index_tool_callback_handler.py

@@ -1,8 +1,10 @@
 import logging
+from collections.abc import Sequence
 
 from core.app.apps.base_app_queue_manager import AppQueueManager, PublishFrom
 from core.app.entities.app_invoke_entities import InvokeFrom
 from core.app.entities.queue_entities import QueueRetrieverResourcesEvent
+from core.rag.entities.citation_metadata import RetrievalSourceMetadata
 from core.rag.index_processor.constant.index_type import IndexType
 from core.rag.models.document import Document
 from extensions.ext_database import db
@@ -85,7 +87,8 @@ class DatasetIndexToolCallbackHandler:
 
                 db.session.commit()
 
-    def return_retriever_resource_info(self, resource: list):
+    # TODO(-LAN-): Improve type check
+    def return_retriever_resource_info(self, resource: Sequence[RetrievalSourceMetadata]):
         """Handle return_retriever_resource_info."""
         self._queue_manager.publish(
             QueueRetrieverResourcesEvent(retriever_resources=resource), PublishFrom.APPLICATION_MANAGER