Implement API endpoints for creating and retrieving product tables.
This allows administrators to define product tables and retrieve them by name.
The creation endpoint is secured and only accessible to administrators.
Adds an authorization policy to restrict access to admin-only endpoints.
Creates an `AdminOnlyRequirement` and `AdminOnlyHandler` to check if a user has admin privileges.
Applies the "AdminOnly" policy to the AdminController to secure admin functionalities.
Modifies the endpoint for changing user admin status to include the user ID in the route.
Moves the ChangeUserAdminStatusRequest to the ApiModels folder.
Updates the admin controller route to "admin" and the admin status
endpoint to "adminStatus".
Makes the ChangeUserAdminStatus method asynchronous.
Uses NotFoundException instead of KeyNotFoundException.
