Generate C# code from Mapping (#842)

* 1

* .

* v

* .

* .

* -

* b

* res b

* Fix UT

* .

* Verify

* v

* ...

* .

* .

* dir

* m

src/WireMock.Net.Abstractions/Types/MappingConverterType.cs

@@ -0,0 +1,11 @@
+namespace WireMock.Types;
+
+/// <summary>
+/// 
+/// </summary>
+public enum MappingConverterType
+{
+    Server,
+
+    Builder
+}

src/WireMock.Net.Abstractions/Types/WireMockList.cs

@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using System.Linq;
 
 namespace WireMock.Types;
 
@@ -63,7 +64,8 @@ public class WireMockList<T> : List<T>
                 return this[0]?.ToString();
 
             default:
-                return base.ToString();
+                var strings = this.Select(x => x as string ?? x?.ToString());
+                return string.Join(", ", strings);
         }
     }
 }