Add unimplemented placeholders

Example/example-app/Sources/AppFeature/AppFeature.swift

Sources/XXClient/Backup/Functors/BackupIsRunning.swift

Sources/XXClient/CMix/Functors/CMixAddHealthCallback.swift

Sources/XXClient/CMix/Functors/CMixGetId.swift

...ors/CMixGetReceptionRegistrationValidationSignature.swift

Sources/XXClient/CMix/Functors/CMixHasRunningProcesses.swift

Sources/XXClient/CMix/Functors/CMixIsHealthy.swift

...es/XXClient/CMix/Functors/CMixNetworkFollowerStatus.swift

Sources/XXClient/CMix/Functors/CMixWaitForNetwork.swift

...XXClient/CMixManager/Functors/CMixManagerHasStorage.swift

Sources/XXClient/Callbacks/UdNetworkStatus.swift

...nt/Channel/Functors/ChannelMaxAsymmetricPayloadSize.swift

...ces/XXClient/Channel/Functors/ChannelMaxPayloadSize.swift

Sources/XXClient/Connection/Functors/ConnectionGetId.swift

...s/XXClient/Connection/Functors/ConnectionGetPartner.swift

...lient/Connection/Functors/ConnectionIsAuthenticated.swift

...XClient/DummyTraffic/Functors/DummyTrafficGetStatus.swift

Sources/XXClient/E2E/Functors/E2EGetContact.swift

Sources/XXClient/E2E/Functors/E2EGetId.swift

Sources/XXClient/E2E/Functors/E2EGetReceptionId.swift