[ADD] telegram_notification: Add module for sending Telegram notifica…

[AnmollGarg]

This PR introduces the telegram_notification module, which allows sending Telegram notifications for sales order events such as confirmation, quotation sending, and cancellation. Key features include:

• Configurable Telegram bots with customizable message templates.
• Event-based notifications for sales orders.
• Dynamic placeholders for personalized messages.
• Multi-chat support for broadcasting notifications.

This module is compatible with Odoo 16.0.

[rousseldenis]

@AnmollGarg What do you think of ?

[pedrobaeza]

Isn't there some overlapping with mail_gateway_telegram here?

[syntax-sensei]

Isn't there some overlapping with mail_gateway_telegram here?

mail_gateway_telegram handles chat with customers, while this sends outbound alerts to internal teams on sales events.