fix(capacitor-ios): enable NonescapableTypes for Capacitor 8.3.0 binary compat

The Capacitor 8.3.0 xcframework was compiled with the experimental
NonescapableTypes feature, gating getString, getBool, getArray, and
reject behind #if $NonescapableTypes in the swiftinterface. Consumers
must enable the same feature to access these APIs.

Author: j3k0

capacitor/Package.swift

@@ -19,6 +19,9 @@ let package = Package(
                 .product(name: "Capacitor", package: "capacitor-swift-pm"),
                 .product(name: "Cordova", package: "capacitor-swift-pm")
             ],
-            path: "ios/Sources/PurchasePlugin")
+            path: "ios/Sources/PurchasePlugin",
+            swiftSettings: [
+                .enableExperimentalFeature("NonescapableTypes")
+            ])
     ]
 )