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/StoreViewModel.cs

@@ -88,6 +88,7 @@ namespace BTCPayServer.Models.StoreViewModels
 
         [Display(Name = "Enable Payjoin/P2EP")]
         public bool PayJoinEnabled { get; set; }
+        public bool CanUsePayJoin { get; set; }
 
         public bool HintWallet { get; set; }
         public bool HintLightning { get; set; }