Add support for Ansattporten #111
Description
Ansattporten is a production-ready Identity Provider owned by Digdir, which supports Rich Authorization Requests backed by Altinn Autorisasjon as an authoritative source.
Texas recently added support for Rich Authorization Requests and has previously added other Digdir-owned Identity Providers.
Adding Ansattporten would not be a too big of a task in that regard, and would simplify the use cases where Ansattporten is the Identity Provider for an application that relies on Texas to perform Token Exchange flows.
Our team would be happy to assist or provide a PR for this feature.
(cc @larsore)