added biogpt token classifier
# What does this PR do?
Added Token Classifier for BioGpt

Fixes #21786


## 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/)? Please add a link
      to it if that's the case.
- [x] 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).
- [x] 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.
@ArthurZucker @younesbelkada @NielsRogge @sgugger

_The documentation is not available anymore as the PR was closed or merged._<|||||>@ArthurZucker am attaching the error from circleci in here. Please do a check on it.
```python
 python setup.py egg_info did not run successfully.
  │ exit code: 1
  ╰─> [7 lines of output]
      fatal: not a git repository (or any of the parent directories): .git
      Traceback (most recent call last):
        File "<string>", line 2, in <module>
        File "<pip-setuptools-caller>", line 34, in <module>
        File "/tmp/pip-install-xnk_5lxf/onnx_fafa120a391e44089efd375a22a6dba2/setup.py", line 72, in <module>
          assert CMAKE, 'Could not find "cmake" executable!'
      AssertionError: Could not find "cmake" executable!
      [end of output]  

``` <|||||>> @ArthurZucker am attaching the error from circleci in here. Please do a check on it.
> 
> ```python
>  python setup.py egg_info did not run successfully.
>   │ exit code: 1
>   ╰─> [7 lines of output]
>       fatal: not a git repository (or any of the parent directories): .git
>       Traceback (most recent call last):
>         File "<string>", line 2, in <module>
>         File "<pip-setuptools-caller>", line 34, in <module>
>         File "/tmp/pip-install-xnk_5lxf/onnx_fafa120a391e44089efd375a22a6dba2/setup.py", line 72, in <module>
>           assert CMAKE, 'Could not find "cmake" executable!'
>       AssertionError: Could not find "cmake" executable!
>       [end of output]  
> ```

You need to pull from main for this!