Refactor and add generators for keystatic and package

The changes include refactoring the create-reader in cms keystatic and changing @keystatic/next version. Additionally, code generators for keystatic and package have been added, and corresponding templates have been organized into their respective directories.

turbo/generators/templates/keystatic/layout.tsx.hbs

@@ -0,0 +1,7 @@
+import KeystaticAdmin from '@kit/keystatic/admin';
+
+export default function Layout() {
+  return (
+    <KeystaticAdmin />
+  );
+}