refactor: implement tenant self queue for rag tasks (#27559)

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Co-authored-by: -LAN- <laipz8200@outlook.com>

api/core/entities/document_task.py

@@ -0,0 +1,15 @@
+from collections.abc import Sequence
+from dataclasses import dataclass
+
+
+@dataclass
+class DocumentTask:
+    """Document task entity for document indexing operations.
+
+    This class represents a document indexing task that can be queued
+    and processed by the document indexing system.
+    """
+
+    tenant_id: str
+    dataset_id: str
+    document_ids: Sequence[str]