Add support for 'useArtboardSize' argument in rive integration (#487)

## What does this change?

Add support for 'useArtboardSize' argument in rive integration

Fixes #486 🎯

## Type of change

- [x] New feature (non-breaking change which adds functionality)

Co-authored-by: magnus.ornebring <[email protected]>

Author: devilbuddy

examples/example/lib/gen/assets.gen.dart

@@ -383,6 +383,7 @@ class RiveGenImage {
     Alignment? alignment,
     Widget? placeHolder,
     bool antialiasing = true,
+    bool useArtboardSize = false,
     List<RiveAnimationController> controllers = const [],
     OnInitCallback? onInit,
   }) {
@@ -395,6 +396,7 @@ class RiveGenImage {
       alignment: alignment,
       placeHolder: placeHolder,
       antialiasing: antialiasing,
+      useArtboardSize: useArtboardSize,
       controllers: controllers,
       onInit: onInit,
     );

packages/core/lib/generators/integrations/rive_integration.dart

@@ -29,6 +29,7 @@ ${isPackage ? "\n  static const String package = '$packageName';" : ''}
     Alignment? alignment,
     Widget? placeHolder,
     bool antialiasing = true,
+    bool useArtboardSize = false,
     List<RiveAnimationController> controllers = const [],
     OnInitCallback? onInit,
   }) {
@@ -41,6 +42,7 @@ ${isPackage ? "\n  static const String package = '$packageName';" : ''}
       alignment: alignment,
       placeHolder: placeHolder,
       antialiasing: antialiasing,
+      useArtboardSize: useArtboardSize,
       controllers: controllers,
       onInit: onInit,
     );