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.Shared/Constants/RegexConstants.cs

@@ -0,0 +1,16 @@
+// Copyright © WireMock.Net
+
+using System;
+
+namespace WireMock.Constants;
+
+/// <summary>
+/// Some constants for Regex.
+/// </summary>
+internal static class RegexConstants
+{
+    /// <summary>
+    /// The default timeout for regex operations.
+    /// </summary>
+    public static readonly TimeSpan DefaultTimeout = TimeSpan.FromSeconds(10);
+}