Content Scanner Service (#5826)

* implemented the content scanner service with caching and a way to use in the state store context

* fix swiftformat comment enforcing

* pr suggestions

ElementX/Sources/Services/Session/UserSession.swift

@@ -16,9 +16,13 @@ class UserSession: UserSessionProtocol {
     
     let clientProxy: ClientProxyProtocol
     let mediaProvider: MediaProviderProtocol
+    
     let voiceMessageMediaManager: VoiceMessageMediaManagerProtocol
     let liveLocationManager: LiveLocationManagerProtocol
     
+    /// Scans media content, `nil` when no content scanner is configured for the server.
+    let contentScannerService: ContentScannerServiceProtocol?
+    
     let callbacks = PassthroughSubject<UserSessionCallback, Never>()
     
     let sessionSecurityStateSubject = CurrentValueSubject<SessionSecurityState, Never>(.init(verificationState: .unknown, recoveryState: .unknown))
@@ -31,6 +35,7 @@ class UserSession: UserSessionProtocol {
         self.mediaProvider = mediaProvider
         self.voiceMessageMediaManager = voiceMessageMediaManager
         self.liveLocationManager = liveLocationManager
+        contentScannerService = clientProxy.contentScanner.map(ContentScannerService.init)
         
         authErrorCancellable = clientProxy.actionsPublisher
             .receive(on: DispatchQueue.main)

ElementX/Sources/Services/Session/UserSessionProtocol.swift

@@ -25,6 +25,9 @@ protocol UserSessionProtocol: Sendable {
     var voiceMessageMediaManager: VoiceMessageMediaManagerProtocol { get }
     var liveLocationManager: LiveLocationManagerProtocol { get }
     
+    /// Scans media content, `nil` when no content scanner is configured for the server.
+    var contentScannerService: ContentScannerServiceProtocol? { get }
+    
     var sessionSecurityStatePublisher: CurrentValuePublisher<SessionSecurityState, Never> { get }
     
     var callbacks: PassthroughSubject<UserSessionCallback, Never> { get }