Add change observer from NCFPK

Signed-off-by: Claudio Cambra <claudio.cambra@nextcloud.com>

shell_integration/MacOSX/NextcloudIntegration/FileProviderExt/FileProviderExtension+ClientInterface.swift

@@ -103,6 +103,8 @@ extension FileProviderExtension: NSFileProviderServicing {
             nextcloudVersion: 25,
             delegate: nil) // TODO: add delegate methods for self
 
+        changeObserver = RemoteChangeObserver(ncKit: ncKit, domain: domain)
+
         Logger.fileProviderExtension.info(
             "Nextcloud account set up in File Provider extension for user: \(user, privacy: .public) at server: \(serverUrl, privacy: .public)"
         )

shell_integration/MacOSX/NextcloudIntegration/FileProviderExt/FileProviderExtension.swift

@@ -23,6 +23,7 @@ import OSLog
     let ncKit = NextcloudKit()
     let appGroupIdentifier = Bundle.main.object(forInfoDictionaryKey: "SocketApiPrefix") as? String
     var ncAccount: Account?
+    var changeObserver: RemoteChangeObserver?
     lazy var ncKitBackground = NKBackground(nkCommonInstance: ncKit.nkCommonInstance)
     lazy var socketClient: LocalSocketClient? = {
         guard let containerUrl = pathForAppGroupContainer() else {