Add support for magic codes

[jpease]

Magic links are great, but sometimes magic codes are useful (e.g. on a computer that does not have access to the user's email). Any chance of this being included in Ash Auth?

[KristerV]

yeah i've bumped into this. i build tools for students and they are not logged in to their email on the school computer, but are on the phone. code (on top of link) would be great.

[jimsynz]

So basically a device flow?