LibWeb/SVG: Implement SVGTransformList.length

Author: https://github.com/jamierocks
Commit: 4a1d02e7d8
Pull-request: https://github.com/SerenityOS/serenity/pull/24525

Userland/Libraries/LibWeb/SVG/SVGTransformList.h

@@ -22,6 +22,8 @@ public:
     [[nodiscard]] static JS::NonnullGCPtr<SVGTransformList> create(JS::Realm& realm);
     virtual ~SVGTransformList() override;
 
+    WebIDL::UnsignedLong length();
+
     WebIDL::ExceptionOr<JS::NonnullGCPtr<SVGTransform>> get_item(WebIDL::UnsignedLong index);
 
     JS::NonnullGCPtr<SVGTransform> append_item(JS::NonnullGCPtr<SVGTransform> new_item);