Refactor Wallet import code (#5638)

* Refactor Wallet import code

The code for wallet import was incredibly messy as it evolved over time from various requests.

This PR:
* splits up each supported format into its own file
* Supports taproot descriptors (through a hack until NBitcoin supports it internally) fixes #5518
* Reduces different paths for handling electrum/non-electrum xpubs
* Allows plugins to add their own import support formats for onchain wallets.

* Update NBitcoin to parse tr descriptors

* Fix warnings

* Use dedicated type OnChainWalletParsers

---------

Co-authored-by: nicolas.dorier <nicolas.dorier@gmail.com>

BTCPayServer/Controllers/UIStoresController.cs

@@ -71,7 +71,8 @@ namespace BTCPayServer.Controllers
             IOptions<ExternalServicesOptions> externalServiceOptions,
             IHtmlHelper html,
             LightningClientFactoryService lightningClientFactoryService,
-            EmailSenderFactory emailSenderFactory)
+            EmailSenderFactory emailSenderFactory,
+            WalletFileParsers onChainWalletParsers)
         {
             _RateFactory = rateFactory;
             _Repo = repo;
@@ -97,6 +98,7 @@ namespace BTCPayServer.Controllers
             _externalServiceOptions = externalServiceOptions;
             _lightningClientFactoryService = lightningClientFactoryService;
             _emailSenderFactory = emailSenderFactory;
+            _onChainWalletParsers = onChainWalletParsers;
             Html = html;
         }
 
@@ -121,6 +123,7 @@ namespace BTCPayServer.Controllers
         private readonly IOptions<ExternalServicesOptions> _externalServiceOptions;
         private readonly LightningClientFactoryService _lightningClientFactoryService;
         private readonly EmailSenderFactory _emailSenderFactory;
+        private readonly WalletFileParsers _onChainWalletParsers;
 
         public string? GeneratedPairingCode { get; set; }
         public WebhookSender WebhookNotificationManager { get; }
@@ -916,7 +919,7 @@ namespace BTCPayServer.Controllers
                 return derivationSchemeSettings;
             }
 
-            var strategy = parser.Parse(derivationScheme);
+            var strategy = parser.Parse(derivationScheme, false, true);
             return new DerivationSchemeSettings(strategy, network);
         }