Convnext flax

[Shubhamai]

Flax Implementation of facebook/convnext-tiny-224

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, 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.
• [x] Did you make sure to update the documentation with your changes? Here are the documentation guidelines, and here are tips on formatting docstrings.
• [x] Did you write any new necessary tests?

Who can review?

Flax: @sanchit-gandhi

TODO

Last Updated : 10 Feb, 2023

• [x] Fixing tests failed in ci/circleci: tests_flax actions.
• [ ] Uploading Shubhamai/convnext-tiny-224 flax weights to facebook/convnext-tiny-224.
• [x] Depends on merge of Improve flax test_attention_outputs PR to pass (or technically skip) test_attention_outputs test.

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint.

[Shubhamai]

@sanchit-gandhi this PR is also ready for your review in case it was missed. And again, thank you so much for taking the time to review the PR.

[Shubhamai]

@sanchit-gandhi Reminder incase my previous message got missed! Also the https://github.com/huggingface/transformers/pull/21472 ( previous reviews implemented ) and https://github.com/huggingface/transformers/pull/21867 PR are awaiting review. Thanks!

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