add WorkerOptions.

- bind IntervalInMin with worker task delay

EnvelopeGenerator.Finalizer/Models/WorkerOptions.cs

@@ -0,0 +1,19 @@
+namespace EnvelopeGenerator.Finalizer.Models;
+
+public class WorkerOptions
+{
+    private double _intervalInMin = 1.0;
+
+    public double IntervalInMin { 
+        get => _intervalInMin; 
+        set 
+        {
+            _intervalInMin = value;
+            IntervalInMillisecond = Min2Millisecond(value);
+        } 
+    }
+
+    public int IntervalInMillisecond { get; private set; } = Min2Millisecond(1.0);
+
+    private static int Min2Millisecond(double min) => Convert.ToInt32(Math.Round(min * 60 * 1000));
+}