Auto-add `timm` tag to timm-wrapper models.
Author: pcuenca
Pull request: yes

# What does this PR do?

Works for fine-tuned or exported models:

```py
from transformers import AutoModelForImageClassification

checkpoint = "timm/vit_base_patch16_224.augreg2_in21k_ft_in1k"
model = AutoModelForImageClassification.from_pretrained(checkpoint)

model.push_to_hub("pcuenq/tw1")
```

The [uploaded model](https://huggingface.co/pcuenq/tw1) will now show snippets for both the timm and the transformers libraries.

cc @Vaibhavs10, @ariG23498, @rwightman 
Related discussion (internal): https://huggingface.slack.com/archives/C04Q17ZPBCP/p1737046243079439?thread_ts=1736804040.905929&cid=C04Q17ZPBCP

---

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## Who can review?

Anyone in the community is free to review the PR once the tests have passed. Feel free to tag
members/contributors who may be interested in your PR.

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Comments:
Merging this now since no more comments came up, thanks @qubvel for the quick review! 🙌 

> # What does this PR do?

This PR likely introduces changes to a 3D model or related code, like texture updates, mesh optimizations, or new assets. Check the description and diff to see the exact changes made!