Add beatmap cs to new `/scores` api

[cyperdark]

Since mania has 4k and 7k as they displayed as separated modes, will be nice to have beatmap cs in new api route, to determine to which one it belongs, also will be cool to have beatmapset id

[cyperdark]

hello, is it possible to add it?

[nanaya]

when in relation to score, I don't think the value is readily available and must be calculated so I don't think it'll be added anytime soon.