fix: Move contacts menu JSON format to public interface

[ChristophWurst]

Summary

Doesn't really fix anything but the spec should be on the interface IMO.

PHP allows this: https://3v4l.org/JbouL

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)

[provokateurin]

I know this can cause problems, but if psalm is green then it's good

[ChristophWurst]

which problems?

[provokateurin]

Some places only work with the implementation so psalm doesn't understand that it needs to inherit the annotation from the interface. But as I said, if psalm is green the change is good.

[ChristophWurst]

Conflicts and has to be redone.