Fix MimePartMatcher and add more tests (#1389)

* mp

* .

* --return

* Fixed

* --

* ...

* fix

* ...

* .

src/WireMock.Net.Abstractions/Admin/Mappings/BodyModel.cs

@@ -8,6 +8,12 @@ namespace WireMock.Admin.Mappings;
 [FluentBuilder.AutoGenerateBuilder]
 public class BodyModel
 {
+    /// <summary>
+    /// The name of the body matcher.
+    /// Currently only "MultiPartMatcher" is supported.
+    /// </summary>
+    public string? MatcherName { get; set; }
+
     /// <summary>
     /// Gets or sets the matcher.
     /// </summary>

src/WireMock.Net.Abstractions/Admin/Requests/LogRequestMatchModel.cs

@@ -1,6 +1,7 @@
 // Copyright © WireMock.Net
 
 using System.Collections.Generic;
+using WireMock.Matchers.Request;
 
 namespace WireMock.Admin.Requests;
 
@@ -47,5 +48,5 @@ public class LogRequestMatchModel
     /// <value>
     /// The match details.
     /// </value>
-    public IList<object> MatchDetails { get; set; }
+    public IList<MatchDetail> MatchDetails { get; set; } = [];
 }