Adding `safetensors` variant of this model

#1

This new file is equivalent to pytorch_model.bin but safe in the sense that
no arbitrary code can be put into it.

These files also happen to load much faster than their pytorch counterpart:
https://colab.research.google.com/github/huggingface/notebooks/blob/main/safetensors_doc/en/speed.ipynb

The widgets on your model page will run using this model even if this is not merged
making sure the file actually works.

Ready to merge
This branch is ready to get merged automatically.

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