refactor: move flame modpack import to separate file

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

launcher/modplatform/flame/FlameInstanceCreationTask.h

@@ -0,0 +1,32 @@
+#pragma once
+
+#include "InstanceCreationTask.h"
+
+#include "modplatform/flame/FileResolvingTask.h"
+
+#include "net/NetJob.h"
+
+class FlameCreationTask final : public InstanceCreationTask {
+    Q_OBJECT
+
+   public:
+    FlameCreationTask(QString staging_path, SettingsObjectPtr global_settings, QWidget* parent)
+        : InstanceCreationTask(), m_parent(parent)
+    {
+        setStagingPath(staging_path);
+        setParentSettings(global_settings);
+    }
+
+    bool abort() override;
+
+    bool createInstance() override;
+
+   private slots:
+    void idResolverSucceeded(QEventLoop&);
+
+   private:
+    QWidget* m_parent = nullptr;
+
+    shared_qobject_ptr<Flame::FileResolvingTask> m_mod_id_resolver;
+    NetJob::Ptr m_files_job;
+};