Add debug operators for KPluginMetaData
This will simplify logging and debugging
Example output:
QDEBUG : KPluginMetaDataTest::testMetaDataQDebugOperator() KPluginMetaData(pluginId:"jsonplugin_cmake_macro", fileName: "/home/user/kde/build/kcoreaddons/bin/namespace/jsonplugin_cmake_macro.so")
QDEBUG : KPluginMetaDataTest::testMetaDataQDebugOperator() QVector<KPluginMetaData> {KPluginMetaData(pluginId:"jsonplugin_cmake_macro", fileName: "/home/user/kde/build/kcoreaddons/bin/namespace/jsonplugin_cmake_macro.so"),}
QDEBUG : KPluginMetaDataTest::testMetaDataQDebugOperator() QVector<KPluginMetaData> {
KPluginMetaData(pluginId:"jsonplugin_cmake_macro", fileName: "/home/user/kde/build/kcoreaddons/bin/namespace/jsonplugin_cmake_macro.so"),
KPluginMetaData(pluginId:"jsonplugin_cmake_macro", fileName: "/home/user/kde/build/kcoreaddons/bin/namespace/jsonplugin_cmake_macro.so"),
KPluginMetaData(pluginId:"jsonplugin_cmake_macro", fileName: "/home/user/kde/build/kcoreaddons/bin/namespace/jsonplugin_cmake_macro.so"),
}