This pull request includes significant changes to the notification service in the src/api/markket directory, introducing new templates and middleware for handling RSVP notifications. The most important changes include the addition of RSVP notification functionality, the creation of reusable email templates, and the integration of a middleware to trigger notifications upon RSVP creation.

Enhancements to notification service:

• src/api/markket/services/notification/index.ts: Added a new function sendRSVPNotification to handle RSVP notifications and reintroduced sendOrderNotification with minor adjustments.
• src/api/markket/services/notification/template.ts: Created reusable email templates, including OrderNotificationHTml and RSVPNotificationHTml, and a layout function emailLayout to standardize email formatting.

Middleware and routing updates:

• src/api/rsvp/middlewares/notification.ts: Added a new middleware to send RSVP notifications using the sendRSVPNotification function.
• src/api/rsvp/routes/rsvp.ts: Updated the RSVP router to include the new notification middleware for the create route.