chore: Breez SDK validation

[grimen]

This pull request introduces a new "Breez SDK Demo" feature to the app, enabling developers to interactively test and debug Breez SDK Spark wallet functionality from within the app's UI. This includes a new demo screen, navigation updates, and a suite of utility methods for wallet operations, payments, deposits, events, and stable balance management. Additionally, the new React Native architecture is enabled for Android builds.

Breez SDK Demo Feature:

• Added a new screen BreezSdkDemoScreen with UI to run and display results from various Breez SDK methods, including wallet info, payments, deposits, events, and stable balance operations. (app/screens/breez-sdk-demo/breez-sdk-demo-screen.tsx)
• Implemented a client module to manage Breez SDK instance lifecycle and configuration, including stable balance token support. (app/screens/breez-sdk-demo/client.ts)

Wallet, Payments, and Stable Balance Methods:

• Added a comprehensive set of async utility methods for Breez SDK operations: wallet info, payment listing, invoice creation, payment preparation/sending (Lightning, on-chain, Spark), deposit management, event subscription, user settings, and stable balance activation/conversion. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12]

Navigation and Type Updates:

• Integrated the new demo screen into the navigation stack and route types. (app/navigation/root-navigator.tsx, app/navigation/stack-param-lists.ts) [1] [2] [3]

Build Configuration:

• Enabled the new React Native architecture for Android by setting newArchEnabled=true in gradle.properties. (android/gradle.properties)