fix(mobile): use cached thumbnail in full size image provider (#20637)

mobile/lib/extensions/codec_extensions.dart

@@ -0,0 +1,10 @@
+import 'dart:ui';
+
+import 'package:flutter/painting.dart';
+
+extension CodecImageInfoExtension on Codec {
+  Future<ImageInfo> getImageInfo({double scale = 1.0}) async {
+    final frame = await getNextFrame();
+    return ImageInfo(image: frame.image, scale: scale);
+  }
+}