Implement allauth

[GDay]

This will overwrite the custom implementation of MFA, OIDC and Google login. Still WIP.

To do:

• Fix tests and add tests where necessary
• Write migration script to:
  • Move recovery keys
  • Move totp secret
  • Make all existing emails verified
• Add OIDC
• Add Google login

[coveralls]

coverage: 93.888% (+0.03%) from 93.854%
when pulling 5039816 on implement-allauth
into 20c45a9 on master.

[compgeniuses]

Hello, Whats the progress and status on this... Assesing its integration with https://github.com/DefGuard/defguard

with a Discussuion here

[GDay]

@compgeniuses I haven't worked on this in a while. Status is still the same, what still needs to be done:

• Heavily manual testing
• Bump allauth to latest version
• Rebase and resolve conflicts

I don't have plans to work on this in near future, unless there is a financial incentive then I can put in my schedule (as mentioned here: #437 (comment)).

It would be good to get this checked by a second developer as it's auth based stuff, which is always a bit tricky. That person would also be paid from the donation to get this finished.