This PR adds more capabilities to the notification UI. Including:
* Displaying new notification types
* Update visual expression based on whether it's read or not
* Mark items as read
* Follow the items link to go to the notification destination
* Cleanup and styled components
Initial draft for notifications UI behind a feature flag. I'd like to
get this merged because the PR is cluttered by open api generation. In
the next PR I will:
* Clean up the SX and introduce styled components
* Add a component for single notifications and implement the
notification list
