Send UTD occurences to Posthog (#2575)

Co-authored-by: Stefan Ceriu <stefan.ceriu@gmail.com>

ElementX/Sources/Services/Client/ClientProxy.swift

@@ -589,6 +589,7 @@ class ClientProxy: ClientProxyProtocol {
             let syncService = try await client
                 .syncService()
                 .withCrossProcessLock(appIdentifier: "MainApp")
+                .withUtdHook(delegate: ClientDecryptionErrorDelegate(actionsSubject: actionsSubject))
                 .finish()
             let roomListService = syncService.roomListService()
             
@@ -803,6 +804,18 @@ private class ClientDelegateWrapper: ClientDelegate {
     }
 }
 
+private class ClientDecryptionErrorDelegate: UnableToDecryptDelegate {
+    private let actionsSubject: PassthroughSubject<ClientProxyAction, Never>
+    
+    init(actionsSubject: PassthroughSubject<ClientProxyAction, Never>) {
+        self.actionsSubject = actionsSubject
+    }
+    
+    func onUtd(info: UnableToDecryptInfo) {
+        actionsSubject.send(.receivedDecryptionError(info))
+    }
+}
+
 private class IgnoredUsersListenerProxy: IgnoredUsersListener {
     private let onUpdateClosure: ([String]) -> Void
 

ElementX/Sources/Services/Client/ClientProxyProtocol.swift

@@ -21,6 +21,7 @@ import MatrixRustSDK
 enum ClientProxyAction {
     case receivedSyncUpdate
     case receivedAuthError(isSoftLogout: Bool)
+    case receivedDecryptionError(UnableToDecryptInfo)
     
     var isSyncUpdate: Bool {
         if case .receivedSyncUpdate = self {