Move CSharpCodeMatcher to a new project (#548)

* matcher

* wip

* fix

* <VersionPrefix>1.4.0</VersionPrefix>

* .

* x

* ?

* netstandard2.1

* {}

* test

* Fix: Assembly with same name is already loaded

* _format file

* AssemblyFile = $"WireMock.CodeHelper.Class{Guid.NewGuid()}"

* AssemblyFile = $"WireMock.CodeHelper.Class{Guid.NewGuid().ToString().Replace("-", "")}"

* GC

* x

* remove load ex

* ret

* readme

* no GC

* GetImplementationTypeByInterface

* ``

* PluginLoader

* type

test/WireMock.Net.Tests/Plugin/PluginLoaderTests.cs

@@ -0,0 +1,35 @@
+using System;
+using FluentAssertions;
+using WireMock.Matchers;
+using WireMock.Plugin;
+using Xunit;
+
+namespace WireMock.Net.Tests.Plugin
+{
+    public class PluginLoaderTests
+    {
+        public interface IDummy
+        {
+        }
+
+        [Fact]
+        public void Load_Valid()
+        {
+            // Act
+            var result = PluginLoader.Load<ICSharpCodeMatcher>(MatchBehaviour.AcceptOnMatch, "x");
+
+            // Assert
+            result.Should().NotBeNull();
+        }
+
+        [Fact]
+        public void Load_Invalid_ThrowsException()
+        {
+            // Act
+            Action a = () => PluginLoader.Load<IDummy>();
+
+            // Assert
+            a.Should().Throw<DllNotFoundException>();
+        }
+    }
+}