Implement API to read & update leaderboard/statistics.

Docs: https://docs.microsoft.com/en-us/gaming/playfab/features/data/playerdata/using-player-statistics

• Create example scene to increase score

• Create example scene to retrieve leaderboard

• Implement new requests

  • Get Friend Leaderboard
    Retrieves a list of ranked friends of the current player for the given statistic, starting from the indicated point in the leaderboard

  • Get Friend Leaderboard Around Player
    Retrieves a list of ranked friends of the current player for the given statistic, centered on the requested PlayFab user. If PlayFabId is empty or null will ret...

  • Get Leaderboard
    Retrieves a list of ranked users for the given statistic, starting from the indicated point in the leaderboard

  • Get Leaderboard Around Player
    Retrieves a list of ranked users for the given statistic, centered on the requested player. If PlayFabId is empty or null will return currently logged in user.

  • Get Player Statistics
    Retrieves the indicated statistics (current version and values for all statistics, if none are specified), for the local player.

  • Get Player Statistic Versions
    Retrieves the information on the available versions of the specified statistic.

  • Update Player Statistics
    Updates the values of the specified title-specific statistics for the user. By default, clients are not permitted to update statistics. Developers may override ...

• Update documentation

Additional notes:

• Leaderboards need to be manually created in the Game Manager
• Leaderboard writing will likely need to be enabled for clients via Policy