Implement a TF2 version of `GPT2ForSequenceClassification`
# 🚀 Feature request

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The architecture `GPT2ForSequenceClassification` was added in #7501 in PyTorch. It would be great to have it in TensorFlow as well.

Below is a list of items to follow to make sure the integration is complete:

- Implement `TFGPT2ForSequenceClassification` in `modeling_tf_gpt2.py`
- Test that architecture in `tests/test_modeling_tf_gpt2.py`
- Add that architecture to `__init__.py` and ` docs/source/model_doc/gpt2.rst`.

Taking a look at the code changes in #7501 would be a good start, as this PR would essentially be a TF2 copy of it.

A very good first issue to get acquainted with the library and its architectures!
May I take a crack at this? :)<|||||>Yes, you may! Thanks @y2s82!<|||||>Hi @LysandreJik , I have completed development for this FR. can you please assign it to me, so i'll raise PR for it.<|||||>Feel free to open a PR