Refine parameter type annotations

[flashJd]

What does this PR do?

Fixes # (issue)
This PR refines the parameter type annotations in the add_tokens and add_special_tokens methods.special_tokens_dict parameter accept list or tuple when key is additional_special_tokens, but parameter type not covered.
The goal is to make the parameter type more clear

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,
  Pull Request section?
• Was this discussed/approved via a Github issue or the forum? 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, and
  here are tips on formatting docstrings.
• 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.

[github-actions]

Hi 👋, thank you for opening this pull request! The pull request is converted to draft by default. When it is ready for review, please click the Ready for review button (at the bottom of the PR page).

[Rocketknight1]

Yep, this looks correct. Thank you for the PR!

[flashJd]

I checked the tests failure:
test_eager_matches_sdpa_inference_1_bfloat16 failure has nothing to do with my code changes
test_add_special_tokens failed because of https ReadTimeout, I run the test local and passed.

python -m unittest tests.models.nougat.test_tokenization_nougat.NougatTokenizationTest.test_add_special_tokens Ran 1 test in 3.781s OK

[Rocketknight1]

Yes, these test failures are unrelated - we're fixing the CI issue internally, so hopefully we can rebase and merge this PR afterwards!

[Rocketknight1]

Hi @flashJd, I think everything should be solved by rebasing onto the latest version of main and force pushing but the Github interface is acting strangely. Can you do the rebase/force push manually and ping me to merge this?

[flashJd]

I've rebased the main branch, @Rocketknight1