✨ Add PyTorch image classification example (#13134)
* :sparkles: add pytorch image classification example
* :fire: remove utils.py
* :lipstick: fix flake8 style issues
* :fire: remove unnecessary line
* :sparkles: limit dataset sizes
* :pushpin: update reqs
* :art: restructure - use datasets lib
* :art: import transforms directly
* :memo: add comments
* :lipstick: style
* :fire: remove flag
* :pushpin: update requirement warning
* :memo: add vision README.md
* :memo: update README.md
* :memo: update README.md
* :art: add image-classification tag to model card
* :truck: rename vision ➡️ image-classification
* :memo: update image-classification README.md