Add Jukebox model (replaces #16875)
This is a draft pull request. 

# What does this PR do?
This PR will progressively add the [Jukebox](https://openai.com/blog/jukebox/) model to the hub.
It is linked to [#16870](https://github.com/huggingface/transformers/issues/16870). 

# Currently planned steps (WIP)

- [x]  Create template files with `transformeres-cli add-new-model-like`
- [x] `src/transformers/tokenization_jukebox.py`
- [x]  `src/transformers/test_tokenization_jukebox.py`
- [x]  `src/transformers/configuration_jukebox.py`
- [x]  `src/transformers/modeling_jukebox.py`
- [x]  `src/transformers/configuration_jukebox.py`
- [x]  `docs/source/model_doc/jukebox.rst`
- [ ] `src/transformers/tokenization_jukebox_fast.py` (will most probably use WordLevel tokenizer). Also requires to implement a converter function `class JukeboxConverter(Converter):`


Replaces (#16875) <|||||>The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_17826). All of your documentation changes will be reflected on that endpoint.<|||||>Okay, the `1b lyrics` and `5b lyrics` match the original code. Just need refactoring to have better variable names and wrap the sampling kwargs for easy use. <|||||>@ArthurZucker let me know when this is ready for the final review<|||||>@ArthurZucker do you want to let me know once you want to have a final review? Let's try to not let it hang around for too long<|||||>Apart from the `kwargs` I think it is done! @patrickvonplaten  feel free to review<|||||>Slow tests are now passing, the only issue left to attend is the memory. The slow tests need a lot of RAM, and running inference with the model should also automatically send the unused `Priors` and `VQVAE` to the `cpu`. 

The documentation and models will be ready soon.<|||||>As it was previously requested, you can now instantiate `JukeboxVQVAE` and `JukeboxPrior` individually. This is convenient if people only want to use the VQVAE or generate form juste the top level prior. <|||||>The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_17826). All of your documentation changes will be reflected on that endpoint.<|||||>The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_17826). All of your documentation changes will be reflected on that endpoint.<|||||>The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_17826). All of your documentation changes will be reflected on that endpoint.