run method
For CLI
Organizes image files according to the settings in the configuration.
Returns the exit code of the operation.
Implementation
Future<int> run() async {
int exitCode = 0;
final List<FileSystemEntity> entities = _getFileEntitiesInDirectory(
config.assetFolderPath, config.fileExtensions, config.recursive);
await writeListToFile(entities);
return exitCode;
}