feat: implement job service

Log:

api/dbus/org.desktopspec.JobManager1.Job.xml

@@ -5,8 +5,8 @@
             <annotation
                 name="org.freedesktop.DBus.Description"
                 value="Value of `Status` is one of
-                       `pending`, `working`, `done`,
-                       `pasuing`, `paused`, `resuming`,
+                       `started`, `running`, `finished`,
+                       `suspending`, `suspend`,
                        `canceled` and `failed`."
             />
         </property>

src/dbus/jobservice.cpp

@@ -13,21 +13,32 @@ JobService::~JobService() {}
 
 QString JobService::status() const
 {
-    // TODO: impl
-    return {};
+    if (job.isFinished())
+        return "finished";
+    if (job.isCanceled())
+        return "canceled";
+    if (job.isSuspended())
+        return "suspended";
+    if (job.isSuspending())
+        return "suspending";
+    if (job.isStarted())
+        return "started";
+    if (job.isRunning())
+        return "running";
+    return "failed";
 }
 
 void JobService::Cancel()
 {
-    // TODO: impl
+    job.cancel();
 }
 
 void JobService::Pause()
 {
-    // TODO: impl
+    job.suspend();
 }
 
 void JobService::Resume()
 {
-    // TODO: impl
+    job.resume();
 }

src/dbus/jobservice.h

@@ -6,6 +6,8 @@
 #define JOBSERVICE_H
 
 #include <QObject>
+#include <QFuture>
+#include <QVariant>
 
 class JobService : public QObject
 {
@@ -22,6 +24,9 @@ public Q_SLOTS:
     void Cancel();
     void Pause();
     void Resume();
+
+private:
+    QFuture<QVariant> job;
 };
 
 #endif