Added torchvision.transforms.v2.Transform.transform overrides to enable torchvision>=0.21 support

[EnriqueGlv]

Several issues were complaining about a NotImplementedError raised by torchvision.transforms.v2.Transform.transform.

The reason of this issue is that torchvision>=0.21 renamed the method that needs to be overridden when creating a custom transform. (see https://pytorch.org/vision/stable/generated/torchvision.transforms.v2.Transform.html#torchvision.transforms.v2.Transform.transform )

To fix this issue without breaking the support of older torchvision versions, I simply duplicated the methods "_transform" of the custom transforms and renamed them "transform".