Extend Checkin API Functionality

[Sak1012]

In PR #420 , the Checkin API was implemented to support a one-time check-in for an event and manage cases where a QR code has already been scanned.

To enhance the API, the following functionalities can be added:

• Support for Multi-Day Check-ins

  Description: Implement check-in functionality for events spanning multiple days. The API should be able to differentiate between days and allow attendees to check in on each day individually.

• Room-Specific Check-in and Check-out

  Description: Add support for room-based check-ins and check-outs, allowing for more convinent tracking within events that have multiple rooms or sessions. Each room should have its own check-in and check-out log for attendees.

Requirements:
These new features will require additional cases in both the Checkin API and the Checklists to properly handle and manage these scenarios.