New component/pattern: Menubar

[Febakke]

Epic for work related to a pattern for navigation

Related to arbeidsflate and autorisasjon.

We do not have a menuItem in our designsystem, but have used our button component. A menuItem will have different needs. For example states and spacing. This component could be used for dropdown, navigation menus, drawers.

• [ ] Define what menu elements should be
  • Should be used in dropdown, left-side navigation, drawer
  • What are the different needs for this? Checkmark, icon, badge

Relevant links

W3 patterns

### Tasks
- [ ] https://github.com/digdir/designsystemet/issues/1545

[mrosvik]

Menu components from other design systems:

• Ant: https://www.antforfigma.com/components/menu
• Atlassian: https://atlassian.design/components/menu/examples
• Carbon: https://carbondesignsystem.com/components/menu/usage/

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• W3: https://www.w3.org/WAI/ARIA/apg/patterns/menubar/examples/menubar-navigation/