Add YOLOS (#16848)

* First draft

* Add YolosForObjectDetection

* Make forward pass work

* Add mid position embeddings

* Add interpolation of position encodings

* Add expected values

* Add YOLOS to tests

* Add integration test

* Support tiny model as well

* Support all models in conversion script

* Remove mid_pe_size attribute

* Make more tests pass

* Add model to README and fix config

* Add copied from statements

* Rename base_model_prefix to vit

* Add missing YOLOS_PRETRAINED_CONFIG_ARCHIVE_MAP

* Apply suggestions from code review

* Apply more suggestions from code review

* Convert remaining checkpoints

* Improve docstrings

* Add YolosFeatureExtractor

* Add feature extractor to docs

* Add corresponding tests

* Fix style

* Fix docs

* Apply suggestion from code review

* Fix bad rebase

* Fix some more bad rebase

* Fix missing character

* Improve docs and variable names

Co-authored-by: Niels Rogge <nielsrogge@Nielss-MacBook-Pro.local>

utils/documentation_tests.txt

@@ -18,6 +18,7 @@ src/transformers/models/big_bird/modeling_big_bird.py
 src/transformers/models/blenderbot/modeling_blenderbot.py
 src/transformers/models/blenderbot_small/modeling_blenderbot_small.py
 src/transformers/models/convnext/modeling_convnext.py
+src/transformers/models/ctrl/modeling_ctrl.py
 src/transformers/models/data2vec/modeling_data2vec_audio.py
 src/transformers/models/data2vec/modeling_data2vec_vision.py
 src/transformers/models/deit/modeling_deit.py
@@ -58,5 +59,5 @@ src/transformers/models/vit_mae/modeling_vit_mae.py
 src/transformers/models/wav2vec2/modeling_wav2vec2.py
 src/transformers/models/wav2vec2/tokenization_wav2vec2.py
 src/transformers/models/wav2vec2_with_lm/processing_wav2vec2_with_lm.py
-src/transformers/models/wavlm/modeling_wavlm.py
-src/transformers/models/ctrl/modeling_ctrl.py	
+src/transformers/models/wavlm/modeling_wavlm.py	
+src/transformers/models/yolos/modeling_yolos.py