Depends on D5110
Introducing a simple `ModalLabel` component, which will be used in e.g. `SubchannelComposer`
{F166990}
Figma:
[[ https://www.figma.com/file/a1nkbWgbgjRlrOY9LVurTz/Comm-%2F-Desktop-app?node-id=1077%3A70464 | https://www.figma.com/file/a1nkbWgbgjRlrOY9LVurTz/Comm-%2F-Desktop-app?node-id=1077%3A70464 ]]