api: add basic (local) database api using storage

packages/core/helpers/storage.js

@@ -0,0 +1,22 @@
+import Convert from "../utils/convert";
+
+class Storage {
+  constructor(context) {
+    this.storage = context;
+  }
+  async write(key, data) {
+    await this.storage.write(key, Convert.toString(data));
+  }
+  async read(key) {
+    let data = await this.storage.read(key);
+    return Convert.fromString(data);
+  }
+  clear() {
+    this.storage.clear();
+  }
+  remove(key) {
+    this.storage.remove(key);
+  }
+}
+
+export default Storage;