revert the addition of platform specific view attributes

-import 'package:flutter/widgets.dart';
-
-import 'package:mobile_scanner/src/mobile_scanner_view_attributes.dart';
-
-/// An implementation for [MobileScannerViewAttributes] for platforms that provide a [Texture].
-class MobileScannerTextureViewAttributes
-    implements MobileScannerViewAttributes {
-  const MobileScannerTextureViewAttributes({
-    required this.textureId,
-    required this.hasTorch,
-    required this.size,
-  });
-
-  /// The id of the [Texture].
-  final int textureId;
-
-  @override
-  final bool hasTorch;
-
-  @override
-  final Size size;
-}

 import 'dart:ui';
 
-/// This interface defines the attributes for the mobile scanner view.
-abstract class MobileScannerViewAttributes {
+/// This class defines the attributes for the mobile scanner view.
+class MobileScannerViewAttributes {
+  const MobileScannerViewAttributes({
+    required this.hasTorch,
+    required this.size,
+  });
+
   /// Whether the current active camera has a torch.
-  bool get hasTorch;
+  final bool hasTorch;
 
   /// The size of the camera output.
-  Size get size;
+  final Size size;
 }

-import 'package:flutter/widgets.dart';
-
-import 'package:mobile_scanner/src/mobile_scanner_view_attributes.dart';
-
-/// An implementation for [MobileScannerViewAttributes] for the web.
-class MobileScannerHtmlViewAttributes implements MobileScannerViewAttributes {
-  const MobileScannerHtmlViewAttributes({
-    required this.htmlElementViewType,
-    required this.hasTorch,
-    required this.size,
-  });
-
-  @override
-  final bool hasTorch;
-
-  /// The [HtmlElementView.viewType] for the underlying [HtmlElementView].
-  final String htmlElementViewType;
-
-  @override
-  final Size size;
-}