chore: Add pylint for storage (#1298)

dbgpt/storage/metadata/db_factory.py

@@ -1,19 +1,26 @@
+"""UnifiedDBManagerFactory is a factory class to create a DatabaseManager instance."""
 from dbgpt.component import BaseComponent, ComponentType, SystemApp
 
 from .db_manager import DatabaseManager
 
 
 class UnifiedDBManagerFactory(BaseComponent):
+    """UnfiedDBManagerFactory class."""
+
     name = ComponentType.UNIFIED_METADATA_DB_MANAGER_FACTORY
+    """The name of the factory."""
 
     def __init__(self, system_app: SystemApp, db_manager: DatabaseManager):
+        """Create a UnifiedDBManagerFactory instance."""
         super().__init__(system_app)
         self._db_manager = db_manager
 
     def init_app(self, system_app: SystemApp):
+        """Initialize the factory with the system app."""
         pass
 
     def create(self) -> DatabaseManager:
+        """Create a DatabaseManager instance."""
         if not self._db_manager:
             raise RuntimeError("db_manager is not initialized")
         if not self._db_manager.is_initialized: