feat: assign users to teams via OIDC claims (#1393)

This change adds the ability to sync teams via a custom openid claim. Vikunja will automatically create and delete teams as necessary, it will also add and remove users when they log in. These teams are fully managed by Vikunja and cannot be updated by a user.

Co-authored-by: kolaente <k@knt.li>
Reviewed-on: https://kolaente.dev/vikunja/vikunja/pulls/1393
Resolves https://kolaente.dev/vikunja/vikunja/issues/1279
Resolves https://github.com/go-vikunja/vikunja/issues/42
Resolves https://kolaente.dev/vikunja/vikunja/issues/950
Co-authored-by: viehlieb <pf@pragma-shift.net>
Co-committed-by: viehlieb <pf@pragma-shift.net>

pkg/modules/auth/openid/providers.go

@@ -125,6 +125,10 @@ func getProviderFromMap(pi map[string]interface{}) (provider *Provider, err erro
 		logoutURL = ""
 	}
 
+	scope, _ := pi["scope"].(string)
+	if scope == "" {
+		scope = "openid profile email"
+	}
 	provider = &Provider{
 		Name:            pi["name"].(string),
 		Key:             k,
@@ -132,6 +136,7 @@ func getProviderFromMap(pi map[string]interface{}) (provider *Provider, err erro
 		OriginalAuthURL: pi["authurl"].(string),
 		ClientSecret:    pi["clientsecret"].(string),
 		LogoutURL:       logoutURL,
+		Scope:           scope,
 	}
 
 	cl, is := pi["clientid"].(int)