See https://github.com/ppy/osu-web/pull/12651 for web-side implementation. To be used to fix https://github.com/ppy/osu/pull/33649/changes#diff-32784a778b34c671e1f72c00e1f4161a5e774e849aae5631ee71b31fc32e5d42R218 (have tested this works there). Use simple set-get rather than transforming to `APIUser.Statistics`
GET /users/lookup