Publish first place scores to redis

[Swan]

quaver:first_place_scores

type redisFirstPlaceScore struct {
  User struct {
      Username string `json:"username"`
  } `json:"user"`
  Map struct {
      Artist         string `json:"artist"`
      Title          string `json:"title"`
      DifficultyName string `json:"difficulty_name"`
  } `json:"map"`
}