Hide overlay UI and show artist credit when held down on the main menu background

[marioobama]

I love art and i also love osu's seasonal main menu backgrounds and i think it'd be nice if i could hold down on the background (just like in song select) to view it without the menu overlay. (and possibly show artist credit in the corner if available)

I know i can just look it up but this would be a nice qol feature and would give the artists a bit more recognition by putting their name directly in the game

[peppy]

We don't have the artist credit metadata in the API right now, but I wouldn't be against this happening.