Format using black, change black within circleci to --check

[bufferoverflow]

based on discussion from #1245

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Name	Status	Preview	Comments	Updated (UTC)
litellm	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 15, 2024 0:21am

[bufferoverflow]

$ python -m black --check .
Skipping .ipynb files as Jupyter dependencies are not installed.
You can fix this by running ``pip install "black[jupyter]"``
would reformat /home/roger/Work/litellm/litellm/integrations/langsmith.py
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Oh no! 💥 💔 💥
22 files would be reformatted, 283 files would be left unchanged.