uninstall method
Implementation
@override
Future<void> uninstall(String artifactName) async {
await initialize();
final active = FlutterGemma.activeModelSpec;
if (active?.files.any((file) => file.filename == artifactName) ?? false) {
await FlutterGemma.clearActiveInferenceIdentity();
}
await FlutterGemma.uninstallModel(artifactName);
}