Add Flax Dinov2 (#31960)

* tfmsenv restored in main

* installed flax

* forward pass done and all tests passed

* make fix-copies and cleaning the scripts

* fixup attempt 1

* fixup attempt 2

* fixup third attempt

* fixup attempt 4

* fixup attempt 5

* dinov2 doc fixed

* FlaxDinov2Model + ForImageClassification added to OBJECTS_TO_IGNORE

* external pos_encoding layer removed

* fixup attempt 6

* fixed integration test values

* fixup attempt 7

* Update src/transformers/models/dinov2/modeling_flax_dinov2.py

Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>

* Update src/transformers/models/dinov2/modeling_flax_dinov2.py

Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>

* Update src/transformers/models/dinov2/modeling_flax_dinov2.py

Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>

* Update src/transformers/models/dinov2/modeling_flax_dinov2.py

Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>

* Update src/transformers/models/dinov2/modeling_flax_dinov2.py

Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>

* Update src/transformers/models/dinov2/modeling_flax_dinov2.py

Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>

* Update src/transformers/models/dinov2/modeling_flax_dinov2.py

Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>

* Update src/transformers/models/dinov2/modeling_flax_dinov2.py

Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>

* Update src/transformers/models/dinov2/modeling_flax_dinov2.py

Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>

* Update src/transformers/models/dinov2/modeling_flax_dinov2.py

Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>

* Update src/transformers/models/dinov2/modeling_flax_dinov2.py

Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>

* Update src/transformers/models/dinov2/modeling_flax_dinov2.py

Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>

* Update src/transformers/models/dinov2/modeling_flax_dinov2.py

Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>

* Update src/transformers/models/dinov2/modeling_flax_dinov2.py

Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>

* Update src/transformers/models/dinov2/modeling_flax_dinov2.py

Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>

* Update src/transformers/models/dinov2/modeling_flax_dinov2.py

Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>

* comments removed

* comment removed from the test

* fixup

* Update src/transformers/models/dinov2/modeling_flax_dinov2.py

Co-authored-by: Sanchit Gandhi <93869735+sanchit-gandhi@users.noreply.github.com>

* new fixes 1

* interpolate_pos_encoding function removed

* droppath rng fixed, pretrained beit copied-from still not working

* modeling_flax_dinov2.py reformatted

* Update tests/models/dinov2/test_modeling_flax_dinov2.py

Co-authored-by: Sanchit Gandhi <93869735+sanchit-gandhi@users.noreply.github.com>

* added Copied from, to the tests

* copied from statements removed from tests

* fixed copied from statements in the tests

* [run_slow] dinov2

---------

Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>
Co-authored-by: Sanchit Gandhi <93869735+sanchit-gandhi@users.noreply.github.com>

docs/source/en/model_doc/dinov2.md

@@ -72,6 +72,9 @@ If you're interested in submitting a resource to be included here, please feel f
 
 [[autodoc]] Dinov2Config
 
+<frameworkcontent>
+<pt>
+
 ## Dinov2Model
 
 [[autodoc]] Dinov2Model
@@ -81,3 +84,20 @@ If you're interested in submitting a resource to be included here, please feel f
 
 [[autodoc]] Dinov2ForImageClassification
     - forward
+
+</pt>
+<jax>
+
+## FlaxDinov2Model
+
+[[autodoc]] FlaxDinov2Model
+    - __call__
+
+
+## FlaxDinov2ForImageClassification
+
+[[autodoc]] FlaxDinov2ForImageClassification
+    - __call__
+
+</jax>
+</frameworkcontent>