Add virtualization

## Scope

Add virtualisation for

- [ ] Infinite grids
- [ ] List of notifications

## Context

Currently, all items in `Carousel` component are displayed as they are, which can cause performance problems when a lot of items are to be displayed.

We should consider adding virtualization so elements that are offscreen don't need to be rendered, possibly something like https://github.com/bvaughn/react-window

Start by locating the Carousel component and reviewing how it currently renders all items. Compare the approach with react-window, then define virtualization for infinite grids and the list of notifications, with offscreen elements no longer rendered and both listed use cases still working.

Written by the indexing model from the issue text.