Add support for other OAuth logins

[star4z]

django-allauth should allow adding of other auth solutions easily. I think Microsoft, Apple, and maybe Github would be good choices to add.
Note that Apple login is not yet supported by django-allauth, see: pennersr/django-allauth#2424. Hopefully the PR will get merged soon, I don't think we should use an unmerged branch as a dependency.
I'm not a big fan of Facebook in terms of their policies, but it could be interesting to use Facebook data to add metadata. If this is added, it needs to be very explicitly explained to the user how the data is being used.
In general, I'm not interested in adding logins for social networks, but productivity apps, especially email providers, are okay candidates for support.