Portrait Main Media Designs

We have some examples of experimental designs to show portrait main media images side-by-side with some of the other article features (headline, standfirst, byline): https://www.theguardian.com/sport/2022/may/16/erin-jackson-interview-speed-skater-winter-olympics

We could bring support for this into the platforms, so that we don't need to achieve this using embeds with client-side JavaScript. This would involve:

1. Building some rough designs to demonstrate how this would work across different `Design`s and `Display`s.
2. Coming up with a way to model this based on the designs. Do we want a new `Display` (e.g. `ImmersivePortrait`)? Do we want to use existing `Display`s coupled with knowledge about the orientation of the main media image?