Adding RT-DETRv2 for object detection (#34773)

* cookiecutter add rtdetrv2

* make modular working

* working modelgit add .

* working modelgit add .

* finalize moduar inheritence

* finalize moduar inheritence

* Update src/transformers/models/rtdetrv2/modular_rtdetrv2.py

Co-authored-by: Cyril Vallez <cyril.vallez@gmail.com>

* update modular and add rename

* remove output ckpt

* define loss_kwargs

* fix CamelCase naming

* fix naming + files

* fix modular and convert file

* additional changes

* fix modular

* fix import error (switch to lazy)

* fix autobackbone

* make style

* add

* update testing

* fix loss

* remove old folder

* fix testing for v2

* update docstring

* fix docstring

* add resnetv2 (with modular bug to fix)

* remove resnetv2 backbone

* fix changes

* small fixes

* remove rtdetrv2resnetconfig

* add rtdetrv2 name to convert

* make style

* Update docs/source/en/model_doc/rt_detr_v2.md

Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>

* Update src/transformers/models/rt_detr_v2/modular_rt_detr_v2.py

Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>

* Update src/transformers/models/rt_detr_v2/modular_rt_detr_v2.py

Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>

* fix modular typo after review

* add reviewed changes

* add final review changes

* Update docs/source/en/model_doc/rt_detr_v2.md

Co-authored-by: Cyril Vallez <cyril.vallez@gmail.com>

* Update src/transformers/models/rt_detr_v2/__init__.py

Co-authored-by: Cyril Vallez <cyril.vallez@gmail.com>

* Update src/transformers/models/rt_detr_v2/convert_rt_detr_v2_weights_to_hf.py

Co-authored-by: Cyril Vallez <cyril.vallez@gmail.com>

* add review changes

* remove rtdetrv2 resnet

* removing this weird project change

* change ckpt name from jadechoghari to author

* implement review and update testing

* update naming and remove wrong ckpt

* name

* make fix-copies

* Fix RT-DETR loss

* Add resources, fix name

* Fix repo in docs

* Fix table name

---------

Co-authored-by: jadechoghari <jadechoghari@users.noreply.huggingface.co>
Co-authored-by: Cyril Vallez <cyril.vallez@gmail.com>
Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>
Co-authored-by: qubvel <qubvel@gmail.com>

docs/source/en/index.md

@@ -305,6 +305,7 @@ Flax), PyTorch, and/or TensorFlow.
 |                      [RoFormer](model_doc/roformer)                      |       ✅        |         ✅         |      ✅      |
 |                       [RT-DETR](model_doc/rt_detr)                       |       ✅        |         ❌         |      ❌      |
 |                [RT-DETR-ResNet](model_doc/rt_detr_resnet)                |       ✅        |         ❌         |      ❌      |
+|                    [RT-DETRv2](model_doc/rt_detr_v2)                     |       ✅        |         ❌         |      ❌      |
 |                          [RWKV](model_doc/rwkv)                          |       ✅        |         ❌         |      ❌      |
 |                           [SAM](model_doc/sam)                           |       ✅        |         ✅         |      ❌      |
 |                  [SeamlessM4T](model_doc/seamless_m4t)                   |       ✅        |         ❌         |      ❌      |