Refactor Transformer (add Scriban) (#562)

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

@@ -0,0 +1,23 @@
+namespace WireMock.Types
+{
+    /// <summary>
+    /// The ResponseMessage Transformers
+    /// </summary>
+    public enum TransformerType
+    {
+        /// <summary>
+        /// https://github.com/Handlebars-Net/Handlebars.Net
+        /// </summary>
+        Handlebars,
+
+        /// <summary>
+        /// https://github.com/scriban/scriban : default
+        /// </summary>
+        Scriban,
+
+        /// <summary>
+        /// https://github.com/scriban/scriban : DotLiquid
+        /// </summary>
+        ScribanDotLiquid
+    }
+}