v0.1.0 of flutter_app_usage_kit

Android UsageStatsManager plugin for querying per-app screen time, foreground events, and installed app metadata. Changelog excerpt: - Initial release. - Query per-app foreground usage statistics via AppUsageKit.queryUsageStats. - Query discrete usage events (foreground, background, screen, keyguard) via AppUsageKit.queryEvents. - List installed apps with metadata and optional PNG icon via AppUsageKit.getInstalledApps/ getAppInfo. - Permission helpers: hasPermissionand openPermissionSettings. - Type-safe Dart↔Kotlin bridge via Pigeon (no dynamicin public API). - Requires Android API 21+. Throws `UnsupportedPlatf[...]