vector-im/element-x-ios/issues/31 - Implement simple SaS sesson verification

* vector-im/element-x-ios/issues/31 - Session verification unit and UI tests
* Fix ImageAnonymizer tests when running on Apple Silicon
* Rename SessionVerification to SessionVerificationScreen

ElementX/Sources/Services/SessionVerification/SessionVerificationControllerProxyProtocol.swift

@@ -0,0 +1,43 @@
+//
+//  SessionVerificationControllerProxyProtocol.swift
+//  ElementX
+//
+//  Created by Stefan Ceriu on 07/06/2022.
+//  Copyright © 2022 Element. All rights reserved.
+//
+
+import Foundation
+import Combine
+
+enum SessionVerificationControllerProxyError: Error {
+    case failedRequestingVerification
+    case failedApprovingVerification
+    case failedDecliningVerification
+    case failedCancellingVerification
+}
+
+enum SessionVerificationControllerProxyCallback {
+    case receivedVerificationData([SessionVerificationEmoji])
+    case finished
+    case cancelled
+    case failed
+}
+
+struct SessionVerificationEmoji: Hashable {
+    let symbol: String
+    let description: String
+}
+
+protocol SessionVerificationControllerProxyProtocol {
+    var callbacks: PassthroughSubject<SessionVerificationControllerProxyCallback, Never> { get }
+    
+    var isVerified: Bool { get }
+        
+    func requestVerification() async -> Result<Void, SessionVerificationControllerProxyError>
+    
+    func approveVerification() async -> Result<Void, SessionVerificationControllerProxyError>
+    
+    func declineVerification() async -> Result<Void, SessionVerificationControllerProxyError>
+    
+    func cancelVerification() async -> Result<Void, SessionVerificationControllerProxyError>
+}