Add option to run the server on http & https (#818)

* HostingProtocol.HttpAndHttps

* .

* .

* .

* HostingScheme

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

@@ -0,0 +1,15 @@
+using System;
+
+namespace WireMock.Types;
+
+[Flags]
+public enum HostingScheme
+{
+    None = 0x0,
+
+    Http = 0x1,
+
+    Https = 0x2,
+
+    HttpAndHttps = Http | Https
+}