feat: Add basic fullscreen support for iPhone (#1857)

- Closes #1444

src/card-controller/fullscreen/provider.ts

@@ -0,0 +1,12 @@
+import { CardFullscreenAPI } from '../types';
+import { FullscreenHandler } from './types';
+
+export class FullscreenProviderBase {
+  protected _api: CardFullscreenAPI;
+  protected _handler: FullscreenHandler;
+
+  constructor(api: CardFullscreenAPI, handler: FullscreenHandler) {
+    this._api = api;
+    this._handler = handler;
+  }
+}