[integration] Update Ray Tune integration for Ray 2.7
Author: justinvyu
Pull request: yes

# What does this PR do?

Ray 2.7 introduced some backwards-incompatible API changes, which broke the HuggingFace transformers integration with Ray Tune `trainer.hyperparameter_search(backend="ray")`. This PR fixes the integration to use the new APIs. Note that this means that the next transformers version will no longer support `ray<2.7`.

I have manually tested this with the example in the Ray repo here: https://github.com/ray-project/ray/pull/40125
This will be regularly tested in CI once this PR is in.

https://github.com/ray-project/ray/issues/39763


## Before submitting
- [ ] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
- [ ] Did you read the [contributor guideline](https://github.com/huggingface/transformers/blob/main/CONTRIBUTING.md#start-contributing-pull-requests),
      Pull Request section?
- [ ] Was this discussed/approved via a Github issue or the [forum](https://discuss.huggingface.co/)? Please add a link
      to it if that's the case.
- [ ] Did you make sure to update the documentation with your changes? Here are the
      [documentation guidelines](https://github.com/huggingface/transformers/tree/main/docs), and
      [here are tips on formatting docstrings](https://github.com/huggingface/transformers/tree/main/docs#writing-source-documentation).
- [ ] Did you write any new necessary tests?


## Who can review?

Anyone in the community is free to review the PR once the tests have passed. Feel free to tag
members/contributors who may be interested in your PR.

@richardliaw

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Models:

- text models: @ArthurZucker and @younesbelkada
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Library:

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- generate: @gante
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- tensorflow: @gante and @Rocketknight1
- tokenizers: @ArthurZucker
- trainer: @muellerzr and @pacman100

Integrations:

- deepspeed: HF Trainer/Accelerate: @pacman100
- ray/raytune: @richardliaw, @amogkam
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Comments:
Tagging @muellerzr @pacman100 -- who can help get this PR in? Thanks!

@justinvyu FYI seems like there's still some errors/issues with this: https://github.com/huggingface/transformers/issues/27598

Ah thanks for confirming the fix with the user, I'll take a look at that.

@muellerzr I took a look at the user issue, and it's actually something in the example that should be changed. The limitation of the integration is that non-serializable objects like (metrics) cannot be supplied to the HF trainer. This PR is good to merge though.

@justinvyu a quick `make style; make quality`; should fix the failures then we should be set and good :) Thanks for your patience!

The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_26499). All of your documentation changes will be reflected on that endpoint.

The test is also failing on main, merging 😉