Init gei-bookings

[TakSeBiegam]

This pull request Init the "gei-bookings" integration, focused on booking services, enhanced error handling, also with documentation in schema. It also introduces pagination, filtering, date handling.

Features:

• User-friendly features such as service management, appointment booking, and interactions within the system.
• Service providers can easily register, update, and remove services, enhancing their control over offerings.
• The system includes detailed booking records, strong error handling, and support for pagination and filtering, ensuring data accuracy and usability.