Feature: add new whatsapp template messages, Single Product, Multiple Products and Product Carousel

This update introduces support for WhatsApp Business Product Templates, including:
1. Single Product Message
Showcase a single product with image, name, price, description, and direct action buttons like “Add to order” or “Message business”.
2. Multiple Product Message
Send a scrollable list of multiple products, each including an image, title, price, and a “View” button that opens detailed product info.
3. Product Carousel Template
Display a carousel-style layout of product cards (with images and pricing) beneath a main message body. Each card links to a product detail view with full description and order options.

📌 Integration Reference:
Meta Developer Docs – Product Card Carousel Templates

These templates improve customer experience and click-through rates by allowing businesses to visually promote products directly within WhatsApp chats.