Issue: https://linear.app/comm/issue/ENG-2738/highlight-drawer-item
Designs this is needed for: https://linear.app/comm/issue/DES-3/designs-for-side-drawer-community-navigation-on-web,
https://www.figma.com/file/a1nkbWgbgjRlrOY9LVurTz/Comm-%2F-Desktop-app?node-id=7284%3A146198&t=CoLi2QV03acY7gv2-4
Before, drawer items had a margin left of 16, and all their children were being indented with them. So each next level had a margin equal to the margin of its parent + 16. But because we will want
to highlight drawer items, and the highlight is supposed to be almost as wide as the drawer, that approach will no longer work.
I will also not take the approach that I took for the styling of labels - where the styling was being determined in `CommunityDrawerContent` and passed down in the `itemData` prop, becaue the function
that is used to create `itemData` is used on both native and web, and native doesn't have a need for this change. Instead I'll have the drawer items take a `padding` prop. Each item will then pass its
`padding` value + 12 (not 16 because the designs have changed) to its children.
I don't love this solution, but it doesn't make native dependent on things it doesn't need, and works without requiring changes if we decide to increase the number of levels.
I highlighted an item to show how it is rendered now, but obviously without the colour:
{F333668}