add return_tensor parameter for feature extraction
# What does this PR do?

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Fixes #10016


## Before submitting
- [ x] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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- [x ] Did you write any new necessary tests?

Addresses [stale issue #10016](https://github.com/huggingface/transformers/issues/10016). Please review @LysandreJik and @Narsil. Thanks.
_The documentation is not available anymore as the PR was closed or merged._<|||||>Feedback has been addressed :)<|||||>Not sure what's happening with CircleCI... <|||||>Last suggestion was addressed, but CircleCI Pipeline still seems broken...<|||||>@ajsanjoaquin do you have circleCI set up on your account/branch ? I remember people sometimes having issues because of this.

Otherwise, could you try to rebase on `main`? 

Pinging @LysandreJik that might know more.<|||||>The CircleCI pipeline seems to be working again!<|||||>For quality can you try

```
pip install transformers[dev]
make fixup
```

?<|||||>@Narsil when running `make fixup`, I get the following error. Perhaps it's possible to replicate on your end?

```
-n was unexpected at this time.
make: *** [Makefile:10: modified_only_fixup] Error 255
```<|||||>> -n was unexpected at this time.

What OS/Linux flavor you're running on ? Shell maybe ? 
Seems like `test -n` is not supported in your environment.<|||||>I'm in a temporary dev environment, so I'm using Windows 😅. I'll use WSL next time. So the formatting error was simply a result of missing newline before importing torch and tf?<|||||>> I'm in a temporary dev environment, so I'm using Windows sweat_smile. I'll use WSL next time. So the formatting error was simply a result of missing newline before importing torch and tf?

We use `black` and `isort` to normalize as much as possible the code, so yes import order is automatically done for you.<|||||>@Narsil can this PR be merged soon when it passes all tests? I just resolved a conflict made by a different commit on the same file.<|||||>@ajsanjoaquin 
It seems there is an issue with your CircleCI permissions, the tests won't run.
Could you try refreshing your permissions as shown [here](https://support.circleci.com/hc/en-us/articles/360048210711-How-to-Refresh-User-Permissions-) ?<|||||>@Narsil the `check_repository_consistency` test is failing because of a .md file unrelated to my PR. Do I have to address this in this PR?

`check_code_quality` is again failing and I can't use `make fixup`. I request you re-fix the latter. 

I hope this can be passed soon before another PR like #19382 modifies the exact code I was working on...<|||||>This PR was based on an old fork of the repo and as such, the pipeline tests were not run. They do not pass, so I will revert the commit. Could you open a new PR with fixed tests?<|||||>I am confused, should we re-open a PR or start from here https://github.com/huggingface/transformers/pull/19679

(I tried re-opening a PR but it resulted in a no-op...)