User management and adding new users with allocated devices

[adityashibu]

This pull request introduces several changes to enhance user management and device allocation functionalities in the backend and frontend of the application. The most important changes include the addition of a new user request model, updates to user management endpoints, and frontend modifications to support role-based access control.

Backend Changes:

• Added UserRequest model to handle user creation with optional allocated devices (backend/fastAPI.py).
• Modified add_new_user endpoint to accept a UserRequest object and handle allocated devices (backend/fastAPI.py).
• Updated add_user function to include allocated devices and user role assignment (backend/users.py) [1] [2].
• Enhanced select_user and get_selected_user functions to include user roles in the response (backend/users.py).

Frontend Changes:

• Introduced role-based access control for device management functionalities (frontend/src/app/devices/page.jsx) [1] [2].
• Added a new user dialog component for adding users with allocated devices (frontend/src/app/ui/newUserDialogue.jsx).
• Modified account menu to display user role and allow super users to add new accounts (frontend/src/app/ui/dashboard/accountMenu.jsx) [1] [2].

[david-g-f]

Looks good