Add ViViT
# What does this PR do?

Fixes #15666. Reopening #20441, as I have missed the comments provided by @amyeroberts so the issue was closed by the bot. 

Add Video Vision Transformer to transformers. This PR implements a spacetime version of the Video Vision Transformer from the original paper. 

I have provided the model weights here https://huggingface.co/jegormeister/vivit-b-16x2-kinetics400 
I will try to add Factorised Encoder version later on (these are the two versions that authors provide weight for).


## Before submitting
- [ ] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
- [x] Did you read the [contributor guideline](https://github.com/huggingface/transformers/blob/main/CONTRIBUTING.md#start-contributing-pull-requests),
      Pull Request section?
- [x] Was this discussed/approved via a Github issue or the [forum](https://discuss.huggingface.co/)? https://github.com/huggingface/transformers/issues/15666
- [x] Did you make sure to update the documentation with your changes? I have added the documentation, but I have troubles testing it as I couldn't run the preview command of the doc-builder, so if someone has the possibility to run and check it, I will be really grateful!
- [x] Did you write any new necessary tests? WIP


## Who can review?

@amyeroberts provided the last suggestions to the closed PR, so I hope you can review this one. Thanks!

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Models:

- albert, bert, xlm: @LysandreJik
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Library:

- benchmarks: @patrickvonplaten
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- datasets: [different repo](https://github.com/huggingface/datasets)
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_The documentation is not available anymore as the PR was closed or merged._<|||||>@amyeroberts thank you for your comments in the previous PR! I have addressed your suggestions and also added the image processor test. 

However, I ran `make style`, however the pipeline was failing at check_code_quality. Therefore I've updated the testing dependencies which lead to black updating. But! When I run `make style` again, it gives the following output:

```sh
reformatted transformers/examples/research_projects/deebert/src/modeling_highway_bert.py
reformatted transformers/examples/research_projects/movement-pruning/emmental/modeling_bert_masked.py
reformatted transformers/src/transformers/models/reformer/modeling_reformer.py
reformatted transformers/src/transformers/models/vivit/modeling_vivit.py
reformatted transformers/tests/models/vivit/test_image_processing_vivit.py
```

So it fixes not only the files from this PR, but also the already existing ones. Therefore I have a question: should I only pus reformatted files from this PR or all?

<|||||>@jegork The files listed e.g. `transformers/examples/research_projects/deebert/src/modeling_highway_bert.py` should have the most recent formatting applied and shouldn't need to be updated with this PR. 

Could you rebase on main, make sure the most recent formatting packages are installed using `pip install -e .[quality]` and try `make style` again? <|||||>@amyeroberts Thanks for your comments. I have addressed everything. However, I still get the same problems with `make style` 
I did `git fetch upstream`, then `git rebase upstream/main`, `pip install -e ".[quality]"` after which I ran `make style`

Which resulted in the following output at the end:
```sh
black examples tests src utils setup.py
Skipping .ipynb files as Jupyter dependencies are not installed.
You can fix this by running ``pip install "black[jupyter]"``
reformatted /Users/jegorkitskerkin/Documents/projects/transformers/examples/research_projects/deebert/src/modeling_highway_bert.py
reformatted /Users/jegorkitskerkin/Documents/projects/transformers/examples/research_projects/movement-pruning/emmental/modeling_bert_masked.py
reformatted /Users/jegorkitskerkin/Documents/projects/transformers/src/transformers/models/vivit/modeling_vivit.py
reformatted /Users/jegorkitskerkin/Documents/projects/transformers/src/transformers/models/reformer/modeling_reformer.py
reformatted /Users/jegorkitskerkin/Documents/projects/transformers/tests/models/vivit/test_image_processing_vivit.py

All done! ✨ 🍰 ✨
5 files reformatted, 2380 files left unchanged.
ruff examples tests src utils setup.py --fix
/Library/Developer/CommandLineTools/usr/bin/make autogenerate_code
running deps_table_update
updating src/transformers/dependency_versions_table.py
/Library/Developer/CommandLineTools/usr/bin/make extra_style_checks
python utils/custom_init_isort.py
python utils/sort_auto_mappings.py
doc-builder style src/transformers docs/source --max_len 119 --path_to_docs docs/source
Overwriting content of src/transformers/models/vivit/modeling_vivit.py.
Cleaned 1 files!
python utils/check_doc_toc.py --fix_and_overwrite
```

As you can see, the same unrelated-to-this-PR-files are getting formatted<|||||>This issue has been automatically marked as stale because it has not had recent activity. If you think this still needs to be addressed please comment on this thread.

Please note that issues that do not follow the [contributing guidelines](https://github.com/huggingface/transformers/blob/main/CONTRIBUTING.md) are likely to be ignored.<|||||>hey @amyeroberts i've managed to fix the formatting-related problems and addressed your comments. However, I seem to be facing some problems with running tests. CI fails with 
```
FAILED tests/models/vivit/test_modeling_vivit.py::VivitModelTest::test_model_outputs_equivalence - Failed: Timeout >120.0s
```

and as I see, `test_model_outputs_equivalence` comes from the `ModelTesterMixin` so I am not sure how to handle this <|||||>@jegork Mmmm, indeed that's odd. It's not immediately clear from the CI traceback why that would happen. 

Are you able to run the tests locally and do they pass?:

```
RUN_SLOW=1 tests/models/vivit/test_modeling_vivit.py::VivitModelTest::test_model_outputs_equivalence
```

<|||||>@amyeroberts yep, everything works and passes locally<|||||>@jegork Thanks for confirming. I'm going to rerun CircleCI in case there was just some transient issue with the run. If it persists we can dig a bit more into it. <|||||>Thanks @amyeroberts and @jegork for working on this, we look forward to using the ViVit model!<|||||>@jegork Is the PR OK to merge? Or are there any other commits you'd like to push before I press the big green button? 🟢 <|||||>@amyeroberts I think it's ready to be merged. Thanks for your help!
<|||||>Hi @jegork congrats on your amazing contribution!

is it ok if we transfer the ViViT checkpoints to the `google` organization on the hub? (assuming they are officially released checkpoints by Google)<|||||>Hey @NielsRogge, thanks!

Sure