

TITLE
Model versioning

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2

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**Write-up about the context for this change, and the enabled features is at https://discuss.huggingface.co/t/announcement-model-versioning-upcoming-changes-to-the-model-hub/1914**

In short:

1. changes to the file downloading code used in `from_pretrained()` methods to use the new file URLs backed by huggingface-hosted git repos.
2. changes to the model upload CLI to create a model repo then be able to git clone and git push to it.
