Create WireMock.Net.MimePart project (#1300)

* Create WireMock.Net.MimePart project

* .

* REFACTOR

* ILRepack

* --

* ...

* x

* x

* .

* fix

* public class MimePartMatcher

* shared

* min

* .

* <!--<DelaySign>true</DelaySign>-->

* Update README.md

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

src/WireMock.Net.Minimal/Util/FileHelper.cs

@@ -0,0 +1,37 @@
+// Copyright © WireMock.Net
+
+using System.Diagnostics.CodeAnalysis;
+using System.Threading;
+using Stef.Validation;
+using WireMock.Handlers;
+
+namespace WireMock.Util;
+
+internal static class FileHelper
+{
+    private const int NumberOfRetries = 3;
+    private const int DelayOnRetry = 500;
+
+    public static bool TryReadMappingFileWithRetryAndDelay(IFileSystemHandler handler, string path, [NotNullWhen(true)] out string? value)
+    {
+        Guard.NotNull(handler);
+        Guard.NotNullOrEmpty(path);
+
+        value = null;
+
+        for (int i = 1; i <= NumberOfRetries; ++i)
+        {
+            try
+            {
+                value = handler.ReadMappingFile(path);
+                return true;
+            }
+            catch
+            {
+                Thread.Sleep(DelayOnRetry);
+            }
+        }
+
+        return false;
+    }
+}