The player leaderboard is an array of objects with the following structure:
The user's wallet address.
The user's rank in the leaderboard.
The number of rounds the user has played across.
topCollections (exists for the global leaderboard)
An array of all the collections the user has played, sorted in descending order of rounds played.
TopCollection model is the following:
The slug of the collection.
The number of collection rounds the