Add DelayMilliseconds property to WorkerOptions

Introduced a configurable DelayMilliseconds property to the WorkerOptions class with validation to ensure the value is at least 1 millisecond. This allows for customizable delay settings in worker operations.

EnvelopeGenerator.ServiceHost/Jobs/WorkerOptions.cs

@@ -1,10 +1,21 @@
-using EnvelopeGenerator.ServiceHost.Jobs.FinalizeDocument;
-using System.Drawing;
-
 namespace EnvelopeGenerator.ServiceHost.Jobs;
 
 public class WorkerOptions
 {
+    private int _delayMilliseconds = 1000;
+
+    public int DelayMilliseconds
+    {
+        get => _delayMilliseconds;
+        set
+        {
+            if (value < 1)
+                throw new ArgumentOutOfRangeException(nameof(value), "Delay must be at least 1 millisecond.");
+
+            _delayMilliseconds = value;
+        }
+    }
+
     public string GdPictureLicenseKey { get; set; } = null!;
 
     public PDFBurnerOptions PdfBurner { get; set; } = new();