Generate C# code from Mapping (#842)

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* v

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* -

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* res b

* Fix UT

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* Verify

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src/WireMock.Net/Extensions/EnumExtensions.cs

@@ -0,0 +1,20 @@
+using System;
+using System.Reflection;
+
+namespace WireMock.Extensions;
+
+internal static class EnumExtensions
+{
+    public static string GetFullyQualifiedEnumValue<T>(this T enumValue)
+        where T : struct, IConvertible
+    {
+        var type = typeof(T);
+
+        if (!type.GetTypeInfo().IsEnum)
+        {
+            throw new ArgumentException("T must be an enum");
+        }
+
+        return $"{type.Namespace}.{type.Name}.{enumValue}";
+    }
+}