Native Picker Implementation - COMPLETED ✅

Based on analysis of the feat/native-picking branch (commit 9f445bf), this PR implements a comprehensive native photo/video picker feature that works on both iOS/macOS and Android without requiring storage permissions.

Implementation Checklist - ALL COMPLETE ✅

• Analyze existing code structure and understand base implementation
• Design improved API for native picker
• Implement Dart API layer
• Implement Android native picker
• Implement iOS/macOS native picker
• Add comprehensive error handling
• Update CHANGELOG.md with feature documentation
• Update example app with picker demo
• Update README documentation
• Fix CI formatting issues
• Resolve merge conflicts with main branch
  • Merged CHANGELOG.md - added native picker feature alongside batch move functionality
  • Resolved test/internal/extensions_test.dart conflict

API Usage Example

// Simple usage - pick up to 9 assets
final assets = await PhotoManager.pickAssets();

// Advanced usage - pick images only
final images = await PhotoManager.pickAssets(
  maxCount: 5,
  requestType: RequestType.image,
);

// Use the assets like any other AssetEntity
for (final asset in assets) {
  final file = await asset.file;
  final thumbnail = await asset.thumbnailData;
  // ... use the asset
}

Platform Support:

• ✅ Android 11+ (API 30+): Full support via Photo Picker API
• ✅ iOS 14+: Full support via PHPickerViewController
• ⚠️ Android < 11: Returns error message
• ⚠️ iOS < 14: Returns error message
• ⚠️ macOS: Returns error message (limited PHPickerViewController support)

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