Fix MimePartMatcher and add more tests (#1389)

* mp

* .

* --return

* Fixed

* --

* ...

* fix

* ...

* .

src/WireMock.Net.Minimal/Matchers/CompositeMatcher.cs

@@ -0,0 +1,46 @@
+// Copyright © WireMock.Net
+
+using System;
+
+namespace WireMock.Matchers;
+
+/// <summary>
+/// Represents a matcher that combines multiple matching strategies into a single composite operation.
+/// </summary>
+public class CompositeMatcher : IMatcher
+{
+    /// <inheritdoc />
+    public string Name => nameof(CompositeMatcher);
+
+    /// <summary>
+    /// The logical operator used to combine the results of the matchers.
+    /// </summary>
+    public MatchOperator MatchOperator { get; }
+
+    /// <inheritdoc />
+    public MatchBehaviour MatchBehaviour { get; }
+
+    /// <summary>
+    /// All matchers.
+    /// </summary>
+    public IMatcher[] Matchers { get; }
+
+    /// <summary>
+    /// Initializes a new instance of the CompositeMatcher class with the specified matchers, operator, and match behaviour.
+    /// </summary>
+    /// <param name="matchers">An array of matchers to be combined. Cannot be null or contain null elements.</param>
+    /// <param name="matchOperator">The logical operator used to combine the results of the matchers.</param>
+    /// <param name="matchBehaviour">The behaviour that determines how the composite matcher interprets the combined results.</param>
+    public CompositeMatcher(IMatcher[] matchers, MatchOperator matchOperator, MatchBehaviour matchBehaviour)
+    {
+        Matchers = matchers;
+        MatchOperator = matchOperator;
+        MatchBehaviour = matchBehaviour;
+    }
+
+    /// <inheritdoc />
+    public string GetCSharpCodeArguments()
+    {
+        throw new NotImplementedException();
+    }
+}