This PR extracts a new `Tab` component from the tabs implementation in
the workspace.
This will allow us to reuse this component anywhere that we need to use
tabs.
Like our other newer components, the `Tab` component has a relatively
open API.
It accepts `children` (or `child`) as well as a `start_slot` and
`end_slot` to position content in the slots on either end of the
content. These slots also respect the `TabCloseSide` and will switch
positions based on this value.
<img width="763" alt="Screenshot 2023-12-07 at 12 19 42 PM"
src="https://github.com/zed-industries/zed/assets/1486634/78e4db6a-f807-431e-8777-f52f2631e6ed">
Release Notes:
- N/A
393be3cedf