Nebius AI Studio provider added (#2866)
* Nebius provider added
* nebius occurance sorted alphabetically
* nebius text-to-image task fixed; tests for nebius provider added
* upload cassettes and update docs
* maintain alphabetical order
* fix merging
* height and width are not required
* Update docs/source/en/guides/inference.md
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Co-authored-by: Akim Tsvigun <aktsvigun@nebius.com>
Co-authored-by: Celina Hanouti <hanouticelina@gmail.com>
Co-authored-by: Lucain <lucainp@gmail.com>
