v0.0.2 of monetization_kit

A complete Flutter monetization toolkit with AdMob ads, Firebase integration, native ads, custom ad widgets, analytics, remote config, and reusable utilities for building production-ready apps. Changelog excerpt: Initial release. ### Added - Firebase Core initialization - Firebase Analytics support - Firebase Crashlytics support - Firebase Remote Config support - Banner Ads - Collapsible Banner Ads - Interstitial Ads - Rewarded Ads - App Open Ads - App Resume Ads - Native Ads - Native Popup Ads - Native Ad Cache Manager - Ad Preload Manager - Ad Frequency Manager - Global Ad Controller - Force Update Service - Android in-app update support - iOS App Store update support - Default shimmer ad placeholder[...]