Comply with Django async syntax

[Archmonger]

Changelog

• fix comply with official django async orm syntax #21
  • Try to use Django's own a* functions (if they exist)
  • Create a* query functions
• Add deprecation warning to async_* query functions
• Fix dependency hell
• Test Django 4+
  • Add DEFAULT_AUTO_FIELD to test app
  • Bump minimum Python version to 3.8 (was easier then creating a new GitHub CI for testing to avoid Py3.7+Dj4)

[Archmonger]

Tests seem to be broken on Windows

PermissionError: [WinError 32] The process cannot access the file because it is being used by another process: 'testdb.sqlite3'

So I'll rely on the GitHub workflow to test this PR.

[rednaks]

Thank you @Archmonger , the idea was to keep both the new django syntax and keep the old one, just to avoid breaking things for those who still use the current syntax.

But perhaps we can add a Deprecation warning for the old one.

[Archmonger]

Sure will do

[Archmonger]

Btw do you want to avoid replacing existing Django methods?

For example, if the user's Django version already has acreate defined, should we avoid monkey patching it? Would help for future compatibility when Django adds real async support.

[Archmonger]

I highly recommend doing a squash merge on this one, since the commit log is quite messy.

[rednaks]

Thank you @Archmonger for this amazing work, I will look at it and squash-merge if everything is good !

[Archmonger]

Let me know when you can review this PR.

After this gets merged, I'll PR the following

• mypy compatibility monkey patch #24
• Remove thread_sensitive=True #25
• Support all methods in the readme #26

[Archmonger]

@rednaks Can you either merge this PR or add me as a maintainer?

I'd like to get his repo into a production-ready state.