refactor(apple): Expose hasUnappliedChanges (#4211)

Exposing the var for now. This is all removed and much simplified in
#4133

swift/apple/FirezoneNetworkExtension/Adapter.swift

@@ -460,6 +460,7 @@ extension Adapter: CallbackHandlerDelegate {
       networkSettings.routes6 = try! JSONDecoder().decode(
         [NetworkSettings.Cidr].self, from: routeList6.data(using: .utf8)!
       ).compactMap { $0.asNEIPv6Route }
+      networkSettings.hasUnappliedChanges = true
 
       networkSettings.apply(on: packetTunnelProvider, logger: self.logger, completionHandler: nil)
     }

swift/apple/FirezoneNetworkExtension/NetworkSettings.swift

@@ -28,7 +28,7 @@ class NetworkSettings {
   private(set) var matchDomains: [String] = [""]
 
   // To keep track of modifications
-  private(set) var hasUnappliedChanges: Bool
+  public var hasUnappliedChanges: Bool
 
   init(
     tunnelAddressIPv4: String, tunnelAddressIPv6: String, dnsAddresses: [String]