feat: 🎸 implement user account association abilities

addons/api/addon/abilities/user.js

@@ -0,0 +1,22 @@
+import ModelAbility from './model';
+
+/**
+ * Provides abilities for users.
+ */
+export default class UserAbility extends ModelAbility {
+  // =permissions
+
+  /**
+   * @type {boolean}
+   */
+  get canAddAccounts() {
+    return this.hasAuthorizedAction('add-accounts');
+  }
+
+  /**
+   * @type {boolean}
+   */
+  get canRemoveAccounts() {
+    return this.hasAuthorizedAction('remove-accounts');
+  }
+}