fix: adding string representation to StoredObject (#582)

Adds string representations to StoredObject
---------

Signed-off-by: Gregor Ambrozic <ambrozic@users.noreply.github.com>
Signed-off-by: Cody Fincher <204685+cofin@users.noreply.github.com>

Author: ambrozic

advanced_alchemy/types/file_object/data_type.py

@@ -70,6 +70,12 @@ def __init__(
         self.multiple = multiple
         self._raw_backend = backend
 
+    def __repr__(self) -> str:
+        """Return a string representation of the StoredObject."""
+        if self.multiple:
+            return f"StoredObject(backend='{self.backend.key}', multiple=True)"
+        return f"StoredObject(backend='{self.backend.key}')"
+
     def process_bind_param(
         self,
         value: "Optional[FileObjectOrList]",