[dotnet] Adding flag to enable SafariDriver logging. (#16196)

* [dotnet] Adding flag to enable SafariDriver logging.

* Update dotnet/src/webdriver/Safari/SafariDriverService.cs

Co-authored-by: Nikolay Borisenko <[email protected]>

* Update dotnet/src/webdriver/Safari/SafariDriverService.cs

Co-authored-by: Nikolay Borisenko <[email protected]>

---------

Co-authored-by: Nikolay Borisenko <[email protected]>

Author: diemol

dotnet/src/webdriver/Safari/SafariDriverService.cs

@@ -20,10 +20,7 @@
 using OpenQA.Selenium.Internal;
 using System;
 using System.IO;
-using System.Net;
-using System.Net.Http;
 using System.Text;
-using System.Threading.Tasks;
 
 namespace OpenQA.Selenium.Safari;
 
@@ -34,6 +31,13 @@ public sealed class SafariDriverService : DriverService
 {
     private const string DefaultSafariDriverServiceExecutableName = "safaridriver";
 
+    /// <summary>
+    /// Enable diagnose logging.
+    /// When set to <see langword="true"/>, the <b>SafariDriver</b> will be started with the <i>--diagnose</i> flag.
+    /// Logs will be written to <i>~/Library/Logs/com.apple.WebDriver/</i>.
+    /// </summary>
+    public bool? Diagnose { get; set; }
+
     /// <summary>
     /// Initializes a new instance of the <see cref="SafariDriverService"/> class.
     /// </summary>
@@ -59,6 +63,12 @@ protected override string CommandLineArguments
         get
         {
             StringBuilder argsBuilder = new StringBuilder(base.CommandLineArguments);
+
+            if (this.Diagnose is true)
+            {
+                argsBuilder.Append(" --diagnose");
+            }
+
             return argsBuilder.ToString();
         }
     }