Request to add DINO object detector

### Model description DINO (do not confuse it with the DINO image encoder from META) is a SOTA DETR-like object detector, improving the denoising training, query initialization, and box prediction. It is based on a combination of the enhancement brought by DN-DETR , DAB-DETR , and Deformable DETR. As it is used as backbone for many other DETR architecture (e.g Co-DETR which is SOTA on COCO test-dev : https://paperswithcode.com/sota/object-detection-on-coco), it would be nice to have it in transformers. Additionnaly, a slighly improved version of DINO, called Stable-DINO, also exist, and should be easily added on top of DINO (only a few lines of code). ### Open source status - [x] The model implementation is available - [x] The model weights are available ### Provide useful links for the implementation Paper : https://arxiv.org/abs/2203.03605 Code : https://github.com/IDEA-Research/DINO Code for Stable-DINO : https://github.com/IDEA-Research/Stable-DINO