This PR adds a tutorial focused on monetization in Horizon Worlds.

This tutorial walks through building a subscription system
Players who purchase a specific IWP (In-World Purchase) will be able to collect coins from the Coin Vault each day they log in.
To make the subscription more enticing, the system will also pay out coins retroactively for all the days they’ve logged in before purchasing.

This mechanic works on two levels:

• Conversion driver: the longer someone plays without subscribing, the more appealing the purchase becomes.
• Retention driver: once subscribed, players have a reason to come back every day to claim the reward they already paid for.