New CSS component: Tab

[devmount]

Is your component request related to a problem? Please describe.
A common way to navigate different views is tab navigaion.

Describe the component you'd like for that problem

• Introducing a new class .tab-group for the parent element
• Having <nav> inside with a list of tabs
• Making tab labels work with badges
• Providing different positions of the tab bar: top (default), bottom, start, end
• Providing vertical tab stacks (for positions start and end)