Fix MimePartMatcher and add more tests (#1389)

* mp

* .

* --return

* Fixed

* --

* ...

* fix

* ...

* .

src/WireMock.Net.Abstractions/Matchers/Request/IRequestMatchResult.cs

@@ -55,4 +55,11 @@ public interface IRequestMatchResult : IComparable
     /// <param name="exception">The exception [Optional].</param>
     /// <returns>The score.</returns>
     double AddScore(Type matcherType, double score, Exception? exception);
+
+    /// <summary>
+    /// Adds the score.
+    /// </summary>
+    /// <param name="matchDetail">The matchDetail.</param>
+    /// <returns>The score.</returns>
+    double AddMatchDetail(MatchDetail matchDetail);
 }

src/WireMock.Net.Abstractions/Matchers/Request/MatchDetail.cs

@@ -12,7 +12,12 @@ public class MatchDetail
     /// <summary>
     /// Gets or sets the type of the matcher.
     /// </summary>
-    public Type MatcherType { get; set; } = null!;
+    public required Type MatcherType { get; set; }
+
+    /// <summary>
+    /// Gets or sets the type of the matcher.
+    /// </summary>
+    public required string Name { get; set; }
 
     /// <summary>
     /// Gets or sets the score between 0.0 and 1.0
@@ -24,4 +29,9 @@ public class MatchDetail
     /// [Optional]
     /// </summary>
     public Exception? Exception { get; set; }
+
+    /// <summary>
+    /// The child MatchResults in case of multiple matchers.
+    /// </summary>
+    public MatchDetail[]? MatchDetails { get; set; }
 }