Stub seek_offset for cache sorting in load loop

The way Safetensors individual weight loading is implemented doesn't
take full advantage of the cache ordering system thing, so this can just
be left at zero for now.

modeling/lazy_loader.py

@@ -222,6 +222,9 @@ class SafetensorsLazyTensor(LazyTensor):
         self.key = key
         self.location = location
 
+        # Stub for cache sorting
+        self.seek_offset = 0
+
     def __view(self, f: Callable):
         return f"{type(self).__name__}(checkpoint_file={f(self.checkpoint_file)}, key={f(self.key)}, location={f(self.location)})"