feat(be): implement contest statistics leaderboard #3274
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Description
대회 종료 후 통계 페이지에서 가장 먼저 볼 수 있는 결과 리더보드에 대한 api 구현
Note
페널티에는 위 이미지의 시간 관련 데이터 대신 페널티 점수 표기
평균 정답률은
(모든 참가자가 맞춘 문제 총 합) / (문제 수 * 참가자 수) * 100으로 계산Additional context
Before submitting the PR, please make sure you do the following
fixes #123).