feat: device authorization RFC 8628 (#5646)

* device auth: implement the write events

* add grant type device code

* fix(init): check if default value implements stringer

---------

Co-authored-by: adlerhurst <silvan.reusser@gmail.com>

internal/api/oidc/auth_request_converter.go

@@ -99,15 +99,6 @@ func (a *AuthRequest) GetSubject() string {
 	return a.UserID
 }
 
-func (a *AuthRequest) Done() bool {
-	for _, step := range a.PossibleSteps {
-		if step.Type() == domain.NextStepRedirectToCallback {
-			return true
-		}
-	}
-	return false
-}
-
 func (a *AuthRequest) oidc() *domain.AuthRequestOIDC {
 	return a.Request.(*domain.AuthRequestOIDC)
 }