Docs: Add example for gunicorn with uvicorn workers

[byte-bot-app]

Add documentation examples for gunicorn w/ uvicorn workers. See the X post below for a user asking a question on this topic.

Ref:

Bad Messages:

Anyone doing gunicorn w/ unicorn workers?
https://x.com/greeduan/status/1732048433408627005?s=46&t=p4oNoKNiN6WSSW5RCWU7_w
@greeduan
@LitestarAPI
do you have any guide for logging when using gunicorn with uvicorn? Spent a few hours and I still can't figure out how to get the app logs out to the gunicorn logs. Meanwhile with Django it's plug-n-play. Not good for prod.

Reported by peter in Discord: <#919193495690936353>:
no but it would be nice to have an example for that

---

Note

While we are open for sponsoring on GitHub Sponsors and
OpenCollective, we also utilize Polar.sh to engage in pledge-based sponsorship.

Check out all issues funded or available for funding on our Polar.sh dashboard

• If you would like to see an issue prioritized, make a pledge towards it!
• We receive the pledge once the issue is completed & verified
• This, along with engagement in the community, helps us know which features are a priority to our users.

[JacobCoffee]

This relates to #2609, partially

[peterschutt]

We were specifically talking about logging with gunicorn workers - great to have a full example, but just want to make sure that the logging topic doesn't get lost.

[provinzkraut]

Thinking about this, I'm not sure if this is actually Litestar specific? The logging setup of gunicorn with uvicorn workers will be exactly the same as for any other ASGI apps. Maybe we don't need to re-invent the wheel here and could just link to existing documentation?