Completely rewrote logic for custom widgets and add new "Frosted-Glass" design

BREAKING CHANGES:

• Removed hardcoded WhatsApp design.
• Rewritten entire logic of customWidgets.
• Moved initialColor and initialStrokeWidth from paintEditorConfigs to imageEditorTheme-paintingEditor.

Features:

• Added new design Frosted-Glass.
• WhatsApp theme is now fully editable.
• Smaller build size and minimal performance boost due to removal of hardcoded WhatsApp design.
• Simplified usage of customWidgets.
• Editor design is now more customizable.

New crop rotate editor and improved performance

feat(release): set version to 3.0.0 and improve performance

- Updated version to 3.0.0 in pubspec.yaml.
- Enhanced performance by making decodeImage an async task in main_editor.dart after closing the crop rotate editor.
- Updated CHANGELOG.md to reflect the version bump and performance improvements.

v2.7.0

feat: Layers can now be selected for rotation, scaling, and deletion,…

2.6.7: fix: correct layer interaction to handle multiple layers

refactor: improve code readability for better maintainability