src/components: add component TableNotifications for displaying user notifications

[maceksimon]

Add component TableNotifications for displaying user notifications on Profile page.

• Add Quasar table with custom slots.
• Add Notification type based on Notification API endpoint.
• Add TableColumn type to emulate Quasar table prop types and prevent typescript error.
• Add translations
• Add tests

[tmszi]

If I click on the table column Notification row link e.g. Challenge completed, should not be row marked as readed?

[tmszi]

First table row Notification column with text New message is not behave as URL link, isn't that a bug?

[maceksimon]

If I click on the table column Notification row link e.g. Challenge completed, should not be row marked as readed?

Yes, this is how it should work.
I implemented a onNotificationClick function that handles this basic case.

[maceksimon]

First table row Notification column with text New message is not behave as URL link, isn't that a bug?

This is intended. In tableNotifications.json, the url is intentionally left out and so it displays title without a link.
Not sure if this can happen in production, but this way, the UI supports "non-clickable" notification if we need it.