in viewer, ensure onTextureUploadComplete callbacks are passed through to KTX1Bundle.createTexture

thermion_dart/lib/src/filament/src/implementation/ffi_ktx1_bundle.dart

@@ -44,13 +44,13 @@ class FFIKtx1Bundle extends Ktx1Bundle {
     return FFIKtx1Bundle(bundle);
   }
 
-  Future<Texture> createTexture() async {
+  Future<Texture> createTexture({VoidCallback? onTextureUploadComplete, int? requestId}) async {
     final texturePtr = await withPointerCallback<TTexture>((cb) {
       Ktx1Reader_createTextureRenderThread(
           (FilamentApp.instance as FFIFilamentApp).engine,
           pointer,
-          0,
-          nullptr,
+          requestId ?? 0,
+          onTextureUploadComplete ?? nullptr,
           cb);
     });
     return FFITexture(FilamentApp.instance!.engine, texturePtr);

thermion_dart/lib/src/filament/src/interface/ktx1_bundle.dart

@@ -1,7 +1,6 @@
 import 'package:thermion_dart/thermion_dart.dart';
 
 abstract class Ktx1Bundle {
-  
   ///
   ///
   ///
@@ -10,7 +9,8 @@ abstract class Ktx1Bundle {
   ///
   ///
   ///
-  Future<Texture> createTexture();
+  Future<Texture> createTexture(
+      {VoidCallback? onTextureUploadComplete, int? requestId});
 
   ///
   ///