refactor: API: Add AuthMethodOIDC class to hold static states

addons/api/addon/classes/auth-method.js

@@ -0,0 +1,15 @@
+/**
+ * Empty auth method definition
+ */
+export class AuthMethod {}
+
+/**
+ * Simple OIDC auth method definition to contain possible oidc states.
+ * @property states {[string]} states
+ */
+export class AuthMethodOIDC extends AuthMethod {
+  /**
+   * Possible auth-method statuses
+   */
+  static states = ['inactive', 'active-private', 'active-public'];
+}