Currently, the auth provider store interface does not have a `Walk` implementation.

While the postgres store has this out of the box, the old bolt store does not currently implement it.

With the release of 4.0.0, we are moving towards postgres, and should introduce the `Walk` method on the store interface for auth providers.

ACCEPTANCE CRITERIA

• `Walk` is added to the store interface of auth providers.
• Within the auth provider data store, `Walk` is used for methods such as `GetAll` or `GetAuthProvidersFiltered`.