Implement BTCPayServer vault derivation scheme import

BTCPayServer/HwiWebSocketTransport.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net.WebSockets;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+using Newtonsoft.Json.Linq;
+
+namespace BTCPayServer
+{
+    public class HwiWebSocketTransport : Hwi.Transports.ITransport
+    {
+        private readonly WebSocketHelper _webSocket;
+
+        public HwiWebSocketTransport(WebSocket webSocket)
+        {
+            _webSocket = new WebSocketHelper(webSocket);
+        }
+        public async Task<string> SendCommandAsync(string[] arguments, CancellationToken cancel)
+        {
+            JObject request = new JObject();
+            request.Add("params", new JArray(arguments));
+            await _webSocket.Send(request.ToString(), cancel);
+            return await _webSocket.NextMessageAsync(cancel);
+        }
+    }
+}