add macOS and uberz material to pubspec

pubspec.yaml

@@ -28,6 +28,9 @@ ffigen:
       - 'ios/include/PolyvoxFilamentApi.h'
 
 flutter:
+  assets:
+    - assets/materials.uberz
+    - assets/materials_ios_arm64.uberz
   plugin:
     platforms:
       android:
@@ -35,6 +38,8 @@ flutter:
         package: app.polyvox.filament
       ios:
         pluginClass: SwiftPolyvoxFilamentPlugin
+      macos:
+        pluginClass: SwiftPolyvoxFilamentPlugin
       windows:
         pluginClass: PolyvoxFilamentPlugin
       linux: