Add DINOv2 to Transformers
### Feature request

Add DINOv2 to the transformers library.

Weights are available in [DINOv2 repo](https://github.com/facebookresearch/dinov2)

### Motivation

Currently, DINOv2 can be used through `torch.hub.load`, but having it ported to transformers directly would be nice to have, and since DINOv1 is already in the library it might not be that difficult to do

### Your contribution

I would love to do a PR to make this addition in the case that it's actually not something hard to do and someone could point me the way that I should look at.
This issue has been automatically marked as stale because it has not had recent activity. If you think this still needs to be addressed please comment on this thread.

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