Improve vision models (#17731)
* Improve vision models
* Add a lot of improvements
* Remove to_2tuple from swin tests
* Fix TF Swin
* Fix more tests
* Fix copies
* Improve more models
* Fix ViTMAE test
* Add channel check for TF models
* Add proper channel check for TF models
* Apply suggestion from code review
* Apply suggestions from code review
* Add channel check for Flax models, apply suggestion
* Fix bug
* Add tests for greyscale images
* Add test for interpolation of pos encodigns
Co-authored-by: Niels Rogge <nielsrogge@Nielss-MacBook-Pro.local>
