Add payjoin option to hot wallet setup (#2450)

* Add payjoin option to hot wallet setup

Enables payjoin by default when creating a hot wallet and offers the user an opt-out.

Test fix

* Display PayJoin option only if it is available

* Test fixes

* Update hot wallet checks

* Test fix after rebase

* Use toggle buttons for enabling options

BTCPayServer/Models/StoreViewModels/WalletSetupRequest.cs

@@ -0,0 +1,10 @@
+using NBXplorer.Models;
+
+namespace BTCPayServer.Models.StoreViewModels
+{
+    public class WalletSetupRequest : GenerateWalletRequest
+    {
+        public bool PayJoinEnabled { get; set; }
+        public bool CanUsePayJoin { get; set; }
+    }
+}