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/route.ts.hbs

@@ -0,0 +1,3 @@
+import { keystaticRouteHandlers } from '@kit/keystatic/route-handler';
+
+export const { POST, GET } = keystaticRouteHandlers;