feat: storage policy API and mirage changes (#2054)

* feat: 🎸 add storage policy API and mirage

addons/api/addon/transforms/object.js

@@ -0,0 +1,34 @@
+/**
+ * Copyright (c) HashiCorp, Inc.
+ * SPDX-License-Identifier: MPL-2.0
+ */
+
+import Transform from '@ember-data/serializer/transform';
+import { TrackedObject } from 'tracked-built-ins';
+
+export default class ObjectTransform extends Transform {
+  /**
+   * @param serialized
+   * @returns {object}
+   */
+  deserialize(serialized) {
+    if (Object.keys(serialized).length) {
+      const obj = new TrackedObject(serialized);
+      return obj;
+    } else {
+      return {};
+    }
+  }
+
+  /**
+   * @param deserialized
+   * @returns {object}
+   */
+  serialize(deserialized) {
+    if (Object.keys(deserialized).length) {
+      return deserialized;
+    } else {
+      return {};
+    }
+  }
+}