fix: fix various timepicker sync issue.

src/Ursa/Controls/DateTimePicker/TimeChangedEventArgs.cs

@@ -0,0 +1,16 @@
+using Avalonia.Interactivity;
+
+namespace Ursa.Controls;
+
+public class TimeChangedEventArgs:RoutedEventArgs
+{
+    public TimeSpan? OldTime { get; }
+
+    public TimeSpan? NewTime { get; }
+
+    public TimeChangedEventArgs(TimeSpan? oldTime, TimeSpan? newTime)
+    {
+        this.OldTime = oldTime;
+        this.NewTime = newTime;
+    }
+}