Add Dataswift.io as a auth provider

[pperzyna]

Is your feature request related to a problem? Please describe.

I would like to use the Dataswift.io solution directly in nuxt-auth

Describe the solution you'd like to see

I would like to see Dataswift auth in the same way as auth0

Describe alternatives you've considered

Create a separate module for Dataswift auth?

Additional context

Dataswift is an out of box solution where you can store your client's data fully in all compliance with GDPR and clients have always the right to see and delete their data.
https://www.youtube.com/watch?v=vYef5SHr08s&ab_channel=DataswiftforDevelopers

[bmulholland]

A PR would be welcome!