chore: skeleton for MusicKitJS abstractions

web/src/ts/player/musickit/index.ts

@@ -0,0 +1,17 @@
+export const useMusicKit = () => {
+    const init = () => {
+        isInit = true;
+    };
+
+    let isInit = false;
+
+    if ( !window.MusicKit ) {
+        document.addEventListener( 'musickitloaded', () => {
+            init();
+        } );
+    } else {
+        init();
+    }
+
+    return {};
+};