add support for REST-ful API building

- allow parameters within url
- allow different methods other then just POST
-> still needs to be tested!

Pilz.Net/Api/ApiMessageHandlerAttribute.cs

@@ -1,9 +1,21 @@
 namespace Pilz.Net.Api;
 
 [AttributeUsage(AttributeTargets.Method)]
-public class ApiMessageHandlerAttribute(string route) : Attribute
+public class ApiMessageHandlerAttribute(string route, params string[] methods) : Attribute
 {
-    public string Route { get; set; } = route;
+    public ApiMessageHandlerAttribute(string route, params HttpMethod[] methods)
+        : this(route, methods.Select(m => m.Method).ToArray())
+    {
+
+    }
+
+    public ApiMessageHandlerAttribute(string route)
+        : this(route, HttpMethod.Post)
+    {
+    }
+
+    public string Route { get; } = route;
+    public string[] Methods { get; } = methods;
     public Type? Serializer { get; set; }
     public bool RequiesAuth { get; set; }
 }