Complete modernization of the AppsFlyer Android binding project

Major Changes

• Platform Migration: Transitioned from Xamarin Android to .NET 8
• MAUI Compatibility: Added full support for .NET MAUI applications
• SDK Update: Updated underlying AppsFlyer SDK to v6.17.0

New Features

• AppSet ID Control: Added DisableAppSetId() method to control AppSet ID collection
• Enhanced DMA Consent: Updated DMA consent implementation with the latest API approach
• MIT License: Added proper MIT license to the project and NuGet package

Sample App Improvements

• Functional Demo: Completely rebuilt sample app that actually works, replacing the previous non-functional implementation
• Live Feedback: Added real-time feedback from SDK callbacks with proper status displays
• Best Practices: Implemented real-world usage patterns demonstrating SDK best practices
• UI Redesign: Refreshed sample app with Material Design
• Better Visuals: Added themed styling with custom color palette
• .NET Logo: Updated app icon to use the .NET logo
• Bug Fixes: Resolved namespace conflicts between app package and classes

Documentation

• Breaking Changes: Clearly documented the transition from Xamarin to .NET 8
• Migration Guide: Added guidance for projects migrating from Xamarin to .NET 8
• API Documentation: Updated all API documentation with the latest syntax and examples
• README Update: Completely modernized README to reflect the .NET 8 binding approach

Technical Debt

• Code Cleanup: Removed unnecessary debugging logs in binding layer
• Packaging: Updated packaging configurations for NuGet compatibility
• Project Structure: Updated to modern .NET project structure and conventions