support facebook video url download via yt-dlp

[devxpy]

Q/A checklist

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

  poetry lock --no-update

• [ ] Run tests

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

• [ ] Do a self code review of the changes - Read the diff at least twice.
• [ ] 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.
• [ ] The relevant pages still run when you press submit
• [ ] The API for those pages still work (API tab)
• [ ] The public API interface doesn't change if you didn't want it to (check API tab > docs page)
• [ ] Do your UI changes (if applicable) look acceptable on mobile?
• [ ] 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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[devxpy]

doesnt work yet because fb doesnt do --format bestaudio

[nikochiko]

@devxpy - fixed with --format bestaudio/best - this will automatically fallback to some video format when bestaudio isn't available. weirdly, when --format ... is not provided, yt-dlp adds an extension like .mp4 at the end of the output filename.

what do you think about the codeql suggestions on this PR?

[devxpy]

lgtm