Make sideshift extend prism in a better way

Plugins/BTCPayServer.Plugins.SideShift/PrismDestinationValidate.cs

@@ -0,0 +1,17 @@
+using System.Threading.Tasks;
+using BTCPayServer.Abstractions.Contracts;
+using Newtonsoft.Json.Linq;
+
+namespace BTCPayServer.Plugins.SideShift;
+
+public class PrismDestinationValidate : IPluginHookFilter
+{
+    public string Hook => "prism-destination-validate";
+    public async Task<object> Execute(object args)
+    {
+        if (args is not string args1 || !args1.StartsWith("sideshift:")) return args;
+        var json  = JObject.Parse(args1.Substring("sideshift:".Length)).ToObject<PrismSideshiftDestination>();
+        return json.Valid();
+    }
+
+}