feat: ios in-app purchase methods (#1652)

* Add in-app purchase methods

* fix: init StoreKit controller on startup

* fix: Add transaction details to StoreKit callbacks

* nullpointer access fixed

* feat: in app purchase for ios

* feat: add IAP product fetching and logging for iOS platform

* feat: iOS Simulator building pipeline made

* feat: add support for multiple IAP product IDs and attempt purchase of the first valid one

* feat: add support for retrieving Base64-encoded app receipt after successful IAP purchase

* refactor: inapp-purchase code cleanup

* feat: iap processing

* refactor: move to storekit 2

* feat: add request to billing

* chore: add ios ifdef

* feat: remove iOS simulator specific code and exclusions

* refactor: remove unused StoreKit 2 transaction observer and simplify IAP product fetching logic

* feat: implement StoreKit 2 for iOS and macOS, add restore purchases functionality

* fix: Restore Purchases button appearance updated

* feat: enhance error handling and duplicate config detection in ApiConfigsController

* feat: add support for Mac OS NE in-app purchases and StoreKitController

* ci-cd fix

* Revert "ci-cd fix"

This reverts commit f22fd7a13b.

---------

Co-authored-by: vladimir.kuznetsov <nethiuswork@gmail.com>
Co-authored-by: vkamn <vk@amnezia.org>
Co-authored-by: spectrum <yyy@amnezia.org>

client/ui/models/servers_model.h

@@ -140,6 +140,7 @@ public slots:
 
     bool isServerFromApiAlreadyExists(const quint16 crc);
     bool isServerFromApiAlreadyExists(const QString &userCountryCode, const QString &serviceType, const QString &serviceProtocol);
+    bool hasServerWithVpnKey(const QString &vpnKey) const;
 
     QVariant getDefaultServerData(const QString roleString);