Support for External Link Reporting and Game Reward Limits

Developers participating in external link programs can now use the new ExternalContentLinkDetails object within ExternalTransaction. This includes fields for linkType (distinguishing between digital content offers and app downloads), externalAppCategory (APP or GAME), and installedAppPackage. Additionally, OneTimeProductOffer has been expanded with OneTimeProductGameRewardOffer, which allows setting a redemptionLimit between 1 and 50 for game-specific rewards. This is a significant addition for developers managing alternative billing or promotional campaigns outside the standard Play Store flow.