feat(mobile): jxl decoder (#32592)

native/native_core/lib/native_core.dart

@@ -0,0 +1,12 @@
+import 'package:ffi/ffi.dart';
+
+import 'src/bindings.g.dart';
+
+String version() {
+  final ptr = native_core_version();
+  try {
+    return ptr.cast<Utf8>().toDartString();
+  } finally {
+    native_core_free_string(ptr);
+  }
+}