feat: add desktopfilegenerator and method addUserApplication

1. change type of ActionName to 'a{sa{ss}}'
2. refactor the method of serialization

Signed-off-by: ComixHe <heyuming@deepin.org>

tests/ut_desktopfilegenerator.cpp

@@ -0,0 +1,61 @@
+// SPDX-FileCopyrightText: 2023 UnionTech Software Technology Co., Ltd.
+//
+// SPDX-License-Identifier: LGPL-3.0-or-later
+
+#include "desktopfilegenerator.h"
+#include <gtest/gtest.h>
+#include <QVariant>
+
+TEST(DesktopFileGenerator, generate)
+{
+    QVariantMap map;
+    map.insert("Type", QString{"Application"});
+    map.insert("Name",
+               QVariant::fromValue(QStringMap{{"default", "UserApp"}, {"zh_CN", "yonghuyingyong"}, {"en_US", "setApplication"}}));
+
+    map.insert("Actions", QStringList{"one", "two"});
+    map.insert("Exec",
+               QVariant::fromValue(QStringMap{
+                   {"default", "/usr/bin/exec"}, {"one", "/usr/bin/exec --type=one"}, {"two", "/usr/bin/exec --type=two"}}));
+    map.insert("Icon", QVariant::fromValue(QStringMap{{"default", "default-icon"}, {"one", "one-icon"}, {"two", "two-icon"}}));
+    map.insert("ActionName",
+               QVariantMap{{"one", QVariant::fromValue(QStringMap{{"default", "oneName"}, {"zh_CN", "yi"}, {"en_US", "one"}})},
+                           {"two", QVariant::fromValue(QStringMap{{"default", "twoname"}, {"zh_CN", "er"}, {"en_US", "two"}})}});
+    map.insert("Version", 1.0);
+    map.insert("Terminal", false);
+    map.insert("MimeType", QStringList{"text/html", "text/xml", "application/xhtml+xml"});
+
+    QString errMsg{"NO ERROR"};
+    auto content = DesktopFileGenerator::generate(map, errMsg);
+    EXPECT_EQ(errMsg.toStdString(), QString{"NO ERROR"}.toStdString());
+
+    QString expect{R"([Desktop Entry]
+Actions=one;two
+Exec=/usr/bin/exec
+Icon=default-icon
+MimeType=text/html;text/xml;application/xhtml+xml
+Name=UserApp
+Name[en_US]=setApplication
+Name[zh_CN]=yonghuyingyong
+Terminal=false
+Type=Application
+Version=1
+X-Deepin-CreateBy=dde-application-manager
+
+[Desktop Action one]
+Exec=/usr/bin/exec --type=one
+Icon=one-icon
+Name=oneName
+Name[en_US]=one
+Name[zh_CN]=yi
+
+[Desktop Action two]
+Exec=/usr/bin/exec --type=two
+Icon=two-icon
+Name=twoname
+Name[en_US]=two
+Name[zh_CN]=er
+
+)"};
+    EXPECT_EQ(expect.toStdString(), content.toStdString());
+}