Add EfficientNet
# What does this PR do?
Adds EfficientNet to transformers, see [original paper](https://arxiv.org/abs/1905.11946) and [repo](https://github.com/keras-team/keras/blob/v2.11.0/keras/applications/efficientnet.py). EfficientNet will be used as the vision encoder of the upcoming ALIGN PR.

- [x] Upload converted checkpoints for image classification
- [x] Create model cards
- [x] Update integration tests

Note: Failing tests are unrelated to this PR, will rebase to the main branch after the failing tests are fixed.

## Before submitting
- [ ] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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      Pull Request section?
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      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?

_The documentation is not available anymore as the PR was closed or merged._<|||||>Hmmm related to #17387, where the mode used is actually EfficientNet.... So it is multimodal, but the processing is on the audio part. Should probably have better synched on this one! <|||||>@ArthurZucker aha, I wasn't aware of Trillson indeed, the final phase of the blocks and the top are different but we could have saved some of the work