[P0] `IntervenableModel.save()` doesn't save trained model parameters

[aryamanarora]

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What happened?

IntervenableModel.save() doesn't save trained model parameters. This is an issue when you are also training e.g. a classification head on top of our model and want to upload it to HF/save it locally. save_intervention() does this properly though.

Code to produce this issue.

No response