Add Cohere as an Inference Provider (#2888)
* Add Cohere as an Inference Provider
* Use new Cohere OpenAI compatible API
* Update docs/source/en/guides/inference.md
* Update src/huggingface_hub/inference/_providers/cohere.py
Co-authored-by: Célina <hanouticelina@gmail.com>
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Co-authored-by: Lucain <lucainp@gmail.com>
Co-authored-by: Lucain <lucain@huggingface.co>
Co-authored-by: Célina <hanouticelina@gmail.com>
