fix: Support mutating anonymous methods (a.k.a delegate) properly (#2898

)

fix: support anonymoud methods (a.k.a delegate) properly

src/Stryker.Core/Stryker.Core.UnitTest/Mutants/CsharpMutantOrchestratorTests.cs

@@ -1230,6 +1230,27 @@ await SendRequest(url, HttpMethod.Get, (request) =>
         ShouldMutateSourceInClassToExpected(source, expected);
     }
 
+    [Fact]
+    public void ShouldMutateDeleage()
+    {
+        var source = @"private void LocalFun()
+{
+	var test = delegate(string name)
+{
+Console.WriteLine($""Hello {name}"");
+};
+}";
+        string expected = @"private void LocalFun()
+{if(StrykerNamespace.MutantControl.IsActive(0)){}else{
+	var test = delegate(string name)
+{if(StrykerNamespace.MutantControl.IsActive(1)){}else{
+if(StrykerNamespace.MutantControl.IsActive(2)){;}else{Console.WriteLine((StrykerNamespace.MutantControl.IsActive(3)?$"""":$""Hello {name}""));
+}}};
+}}";
+
+        ShouldMutateSourceInClassToExpected(source, expected);
+    }
+
     [Fact]
     public void MutationsShouldHaveLinespan()
     {

src/Stryker.Core/Stryker.Core/Mutants/CsharpNodeOrchestrators/AnonymousFunctionExpressionOrchestrator.cs

@@ -10,6 +10,7 @@ internal class AnonymousFunctionExpressionOrchestrator : BaseFunctionOrchestrato
 
     protected override ParameterListSyntax ParameterList(AnonymousFunctionExpressionSyntax node) => node switch {ParenthesizedLambdaExpressionSyntax parenthesizedLambda => parenthesizedLambda.ParameterList,
         SimpleLambdaExpressionSyntax simpleLambda => SyntaxFactory.ParameterList(SyntaxFactory.SingletonSeparatedList(simpleLambda.Parameter)),
+        AnonymousMethodExpressionSyntax anonymousMethod => anonymousMethod.ParameterList,
         _ => throw new ArgumentOutOfRangeException(nameof(node), node, null)
     };