Leaderboard Component

[loothero]

Data Structure:

struct Leaderboard {
    #[key]
    game_id: u64,
    first: Score,
    second: Score, 
    third: Score,
    forth: Score,
    fifth: Score,
    six: Score,
    seventh: Score,
   eighth: Score,
   ninth: Score,
   tenth: Score
}

struct Score {
    character_id: u64,
    xp: u16
}

# System Calls
# - is_top_score(xp)
# - update_leaderboard(character_id)