:sparkles: Add CRUD methods to `AuthStorage` interface for `AuthProvider` models

[linkdd]

Scope

other

Desired Behavior

Needed methods:

• ListAuthProviders
• FetchAuthProvider (by name)
• SaveAuthProvider
• DeleteAuthProvider

Then, implement said methods in the BadgerDB storage backend. Data model should be:

Key	Value
provider:<provider type>:<provider name>	AuthProvider model encoded in JSON

[devnoct]

Happy to take this one too, right after #1373 the CRUD methods depend on the
AuthProvider model, so I'll do them in that order. Thanks

[linkdd]

@devnoct without news from you, I'm reassigning this issue to another dev.