Auto: twincat-1.2 — native UA TIME/DATE/DT/TOD

IEC 61131-3 TIME/TOD now surface as TimeSpan (UA Duration); DATE/DT
surface as DateTime (UTC). The wire form stays UDINT — AdsTwinCATClient
post-processes raw values in ReadValueAsync and OnAdsNotificationEx,
and accepts native CLR types in ConvertForWrite. Added Duration to
DriverDataType (back-compat: existing switches default to BaseDataType
for unknown enum values) and mapped it to DataTypeIds.Duration in
DriverNodeManager.

Closes #306

src/ZB.MOM.WW.OtOpcUa.Driver.TwinCAT/TwinCATDataType.cs

@@ -42,8 +42,11 @@ public static class TwinCATDataTypeExtensions
         TwinCATDataType.Real => DriverDataType.Float32,
         TwinCATDataType.LReal => DriverDataType.Float64,
         TwinCATDataType.String or TwinCATDataType.WString => DriverDataType.String,
-        TwinCATDataType.Time or TwinCATDataType.Date
-            or TwinCATDataType.DateTime or TwinCATDataType.TimeOfDay => DriverDataType.Int32,
+        // IEC 61131-3 TIME / TOD are durations (ms); DATE / DT are absolute timestamps.
+        // The wire form is UDINT but the driver post-processes into TimeSpan / DateTime so the
+        // address space surfaces native UA Duration / DateTime instead of opaque integers.
+        TwinCATDataType.Time or TwinCATDataType.TimeOfDay => DriverDataType.Duration,
+        TwinCATDataType.Date or TwinCATDataType.DateTime => DriverDataType.DateTime,
         TwinCATDataType.Structure => DriverDataType.String,
         _ => DriverDataType.Int32,
     };