Tracing: Add qml, register types via qt_add_qml_module

Use the CMake-based qml API to create the "QtCreator.Tracing" module.
This uses qt_add_qml_module, which was introduced with Qt 6.2.

For Qt 6.1 and below, everything compiles and runs like before this
change.

Change-Id: I4d63f9f724d0628cfaab9d1164c0d575f15d15aa
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>

src/plugins/qmlprofiler/flamegraphview.cpp

@@ -46,7 +46,9 @@ FlameGraphView::FlameGraphView(QmlProfilerModelManager *manager, QWidget *parent
     setObjectName("QmlProfiler.FlameGraph.Dock");
     setWindowTitle(tr("Flame Graph"));
 
+#if QT_VERSION < QT_VERSION_CHECK(6, 2, 0)
     qmlRegisterType<FlameGraph::FlameGraph>("QtCreator.Tracing", 1, 0, "FlameGraph");
+#endif // Qt < 6.2
     qmlRegisterUncreatableType<FlameGraphModel>("QtCreator.QmlProfiler", 1, 0,
                                                 "QmlProfilerFlameGraphModel",
                                                 QLatin1String("use the context property"));