Implement Logout Functionality to Facilitate Patient Switching

[this-Aditya]

Description

To address the need for using the app in clinic or hospital environments where the same device and app instance are used with multiple patients, we propose implementing a logout functionality. This will allow clinicians to log out from the app and redirect them to the login screen, enabling a seamless transition between patients.

Redirect to Login:
After logging out, the user should be redirected to the login screen, allowing them to scan a new QR code for a different patient.

Related to RADAR-base/radar-prmt-android#145