Get leaderboard

curl --request GET \
  --url http://localhost:8080/api/v1/developers/leaderboard \
  --header 'Authorization: Bearer <token>'

[
  {
    "username": "<string>",
    "score": 123,
    "details": {
      "total_stars": 123,
      "total_commits": 123,
      "sui_repo_count": 123,
      "experience_days": 123,
      "total_size_kb": 123,
      "language_count": 123,
      "last_activity": "<string>",
      "onboarded_date": "<string>"
    }
  }
]