Add __repr__ for CustomTransferMap

Author: jank324

cheetah/accelerator.py

@@ -234,6 +234,13 @@ def broadcast(self, shape: Size) -> Element:
     def is_skippable(self) -> bool:
         return True
 
+    def __repr__(self):
+        return (
+            f"{self.__class__.__name__}(transfer_map={repr(self._transfer_map)}, "
+            + f"length={repr(self.length)}, "
+            + f"name={repr(self.name)})"
+        )
+
     def defining_features(self) -> list[str]:
         return super().defining_features + ["transfer_map"]