Expose notifications API as non-hook functions

[lmatejic-CROZ]

Basic information

• nrich-frontend version: 3.0.1
• Module: notification

Enhancement description

Currently the only way to use the notifications API is via the useNotifications hook. There are instances where we need just standard JS functions to satisfy the React naming conventions and linters. One such example is using the notifications with API calls or related interceptors which are not a hook or part of a React component.

As-is, the current logic would work even outside of React components, so it's basically only required to re-export under a different naming convention.