Refactor auth code to output auth scheme in OpenAPI spec

[nikochiko]

Helpful for generating SDKs

Q/A checklist

• [x] If you add new dependencies, did you update the lock file?

  poetry lock --no-update

• [x] Run tests

  ulimit -n unlimited && ./scripts/run-tests.sh

• [x] Do a self code review of the changes - Read the diff at least twice.
• [x] Carefully think about the stuff that might break because of this change - this sounds obvious but it's easy to forget to do "Go to references" on each function you're changing and see if it's used in a way you didn't expect.
• [x] The relevant pages still run when you press submit
• [x] The API for those pages still work (API tab)
• [x] The public API interface doesn't change if you didn't want it to (check API tab > docs page)
• [x] Do your UI changes (if applicable) look acceptable on mobile?
• [x] Ensure you have not regressed the import time unless you have a good reason to do so. You can visualize this using tuna:

  python3 -X importtime -c 'import server' 2> out.log && tuna out.log

  To measure import time for a specific library:

  
  $ time python -c 'import pandas'

---

Executed in 1.15 secs fish external usr time 2.22 secs 86.00 micros 2.22 secs sys time 0.72 secs 613.00 micros 0.72 secs

To reduce import times, import libraries that take a long time inside the functions that use them instead of at the top of the file:
```python
def my_function():
    import pandas as pd
    ...

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[nikochiko]

The tradeoff is that the auto-generated documentation is not as straightforward (and less helpful). I hope this gets fixed with newer FastAPI versions, or adding curl examples in the reference doc.