[Django] #36776: Note that the dev server is running in WSGI mode

[Django]

#36776: Note that the dev server is running in WSGI mode
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Reporter: Matthew Pava | Type:
| Cleanup/optimization
Status: new | Component:
| Documentation
Version: 6.0 | Severity: Normal
Keywords: | Triage Stage:
| Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 1 | UI/UX: 0
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With the mass adoption of async Django on the way, we need to provide a
clearer warning in the development server that it is running in WSGI mode
and not ASGI mode. I spent an hour troubleshooting a warning because I
created a middleware that was async only. Only when I made it compatible
for both async and sync modes did the warning go away.

Or we could just make the Django dev server default to ASGI mode.

Actual result:
The Django server displays this warning:
WARNING: This is a development server. Do not use it in a production
setting. Use a production WSGI or ASGI server instead.
For more information on production servers see:
https://docs.djangoproject.com/en/6.0/howto/deployment/

Desired result:
Revise it to something like:
WARNING: This is a development server that is running only in sync mode
(WSGI). Only middleware that is compatible with sync mode (WSGI) will run
properly. Do not use it in a production setting. Use a production WSGI or
ASGI server instead.
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Ticket URL: <https://code.djangoproject.com/ticket/36776>
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