add GitHub Discussions to django-oauth-toolkit

[n2ygk]

Please enable GitHub Discussions for django-oauth-toolkit. Thanks!

[jezdez]

Hey @n2ygk, I'm going through my backlog and this...is old. Is this still something you'd like to do? FWIW, it'll be up to the project leads to make sure the Jazzband Code of Conduct is enforced in this forum, since I don't have additional time to review every posting there. I hope you understand :)