Add Push Notification with FCM node-typescript

What does this PR do?

This pull request adds a new template for "Push Notifications with FCM" using Node.js and TypeScript. It includes:

• A .gitignore file to ignore unnecessary files.
• A README.md to document the usage, configuration, and environment variables needed.
• Source files (main.ts and utils.ts) to handle sending push notifications using Firebase Cloud Messaging.
• Configuration files for TypeScript and Prettier.
• A package.json and package-lock.json to manage dependencies.

Test Plan

I have created a test script from which a user can test the flow of push notification.

After adding necessary env variables and adjusting test.js file

Have you read the [Contributing Guidelines on issues]

Yes :)