fix: AugmentedTensor clone method

[jsalotti]

Problem

Some mutable attributes of the original tensor were not deeply copied to the clone tensor. Therefore a modification of these attributes in the clone tensor was also applied to the original tensor.
Attributes : _property_list, _children_list, _child_property

Exemple

Adding a child to the cloned tensor modifies the original tensor, which cannot be cloned again.

f = Frame(torch.ones((2, 5, 5)))
clone1 = f.clone()
clone1.add_child("childname", SpatialAugmentedTensor(torch.ones((2, 5, 5)), names=("C", "H", "W")))
clone2 = f.clone()

results in this error :

Traceback (most recent call last):
  File "_sandbox/clone.py", line 7, in <module>
    clone2 = f.clone()
  File "/home/julien/dev/aloception/aloscene/tensors/augmented_tensor.py", line 321, in clone
    n_frame = super().clone(*args, **kwargs)
  File "/home/julien/dev/aloception/aloscene/tensors/augmented_tensor.py", line 586, in __torch_function__
    setattr(tensor, name, getattr(self, name))
  File "/home/julien/dev/aloception/aloscene/tensors/augmented_tensor.py", line 1027, in __getattribute__
    return super().__getattribute__(name)
AttributeError: 'Frame' object has no attribute 'childname'

Solution

Make a deep copy of the attributes instead of a shallow one