Add OWLv2, bis (#26668)

* First draft

* Update conversion script

* Update copied from statements

* Fix style

* Add copied from to config

* Add copied from to processor

* Run make fixup

* Add docstring

* Update docstrings

* Add method

* Improve docstrings

* Fix docstrings

* Improve docstrings

* Remove onnx

* Add flag

* Address comments

* Add copied from to model tests

* Add flag to conversion script

* Add code snippet

* Address more comments

* Address comment

* Improve conversion script

* More improvements

* Add expected objectness logits

* Skip test

* Improve conversion script

* Extend conversion script

* Convert large checkpoint

* Fix doc tests

* Convert all checkpoints, update integration tests

* Add checkpoint_path arg

* Fix repo_id

docs/source/en/_toctree.yml

@@ -695,6 +695,8 @@
         title: OneFormer
       - local: model_doc/owlvit
         title: OWL-ViT
+      - local: model_doc/owlv2
+        title: OWLv2
       - local: model_doc/perceiver
         title: Perceiver
       - local: model_doc/pix2struct