Added support for Authentiq OAuth provider

What does this MR do?

This MR adds support for the Authentiq OAuth provider. When activated in the configuration, it will let your users to sign in using the Authentiq ID app on their phone instead of passwords. See https://www.authentiq.com/

Are there points in the code the reviewer needs to double check?

Note that the sign in with Authentiq option will only show up if added / uncommented in config.yml

Why was this MR needed?

To support Authentiq and the AuthentiqID apps for iOS and Android as a method of signing in and registration.

Screenshots

See below. Note that this will only appear if this is added / uncommented in the config.yml file.

Does this MR meet the acceptance criteria?

Yes. Note that some items below are set to N/A as this MR consists of configuration options and not actual code.

• Changelog entry added
• [N/A] Documentation created/updated
• [N/A] API support added
• Tests
  • [N/A] Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

N/A