feat(RD): add resource pack downloader

Signed-off-by: flow <flowlnlnln@gmail.com>

launcher/ui/dialogs/ResourceDownloadDialog.h

@@ -35,6 +35,7 @@ class QVBoxLayout;
 class QDialogButtonBox;
 class ResourceDownloadTask;
 class ResourceFolderModel;
+class ResourcePackFolderModel;
 
 namespace ResourceDownload {
 
@@ -108,4 +109,23 @@ class ModDownloadDialog final : public ResourceDownloadDialog {
     BaseInstance* m_instance;
 };
 
+class ResourcePackDownloadDialog final : public ResourceDownloadDialog {
+    Q_OBJECT
+
+   public:
+    explicit ResourcePackDownloadDialog(QWidget* parent,
+                                        const std::shared_ptr<ResourcePackFolderModel>& resource_packs,
+                                        BaseInstance* instance);
+    ~ResourcePackDownloadDialog() override = default;
+
+    //: String that gets appended to the resource pack download dialog title ("Download " + resourcesString())
+    [[nodiscard]] QString resourcesString() const override { return tr("resource packs"); }
+    [[nodiscard]] QString geometrySaveKey() const override { return "RPDownloadGeometry"; }
+
+    QList<BasePage*> getPages() override;
+
+   private:
+    BaseInstance* m_instance;
+};
+
 }  // namespace ResourceDownload