Add permission handling for image picker to prevent crashes when permission is denied.
* **Android Manifest**: Add permissions for reading and writing external storage.
* **Permission Service**: Create a new service to handle permission requests using the `permission_handler` package.
* **Image Picker UI**: Modify the image picker to check and request permissions before accessing media. Show a popup if permission is denied.
* **Example App**: Update the example app to include permission handling and show a dialog if permission is denied.
* **Dependencies**: Add `permission_handler` dependency in `pubspec.yaml`.
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