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/MockSessionVerificationControllerProxy.swift

@@ -0,0 +1,62 @@
+//
+//  MockSessionVerificationControllerProxy.swift
+//  ElementX
+//
+//  Created by Stefan Ceriu on 07/06/2022.
+//  Copyright © 2022 Element. All rights reserved.
+//
+
+import Foundation
+import MatrixRustSDK
+import Combine
+
+struct MockSessionVerificationControllerProxy: SessionVerificationControllerProxyProtocol {
+    var callbacks = PassthroughSubject<SessionVerificationControllerProxyCallback, Never>()
+    
+    var isVerified: Bool = false
+    
+    func requestVerification() async -> Result<Void, SessionVerificationControllerProxyError> {
+        DispatchQueue.global(qos: .background).asyncAfter(deadline: .now() + 2.0) {
+            callbacks.send(.receivedVerificationData(Self.emojis))
+        }
+        
+        return .success(())
+    }
+    
+    func approveVerification() async -> Result<Void, SessionVerificationControllerProxyError> {
+        DispatchQueue.global(qos: .background).asyncAfter(deadline: .now() + 2.0) {
+            callbacks.send(.finished)
+        }
+        
+        return .success(())
+    }
+    
+    func declineVerification() async -> Result<Void, SessionVerificationControllerProxyError> {
+        DispatchQueue.global(qos: .background).asyncAfter(deadline: .now() + 2.0) {
+            callbacks.send(.cancelled)
+        }
+        
+        return .success(())
+    }
+    
+    func cancelVerification() async -> Result<Void, SessionVerificationControllerProxyError> {
+        DispatchQueue.global(qos: .background).asyncAfter(deadline: .now() + 2.0) {
+            callbacks.send(.cancelled)
+        }
+        
+        return .success(())
+    }
+    
+    // MARK: - Private
+    
+    static var emojis: [SessionVerificationEmoji] {
+        [SessionVerificationEmoji(symbol: "🦋", description: "Butterfly"),
+         SessionVerificationEmoji(symbol: "🐘", description: "Elephant"),
+         SessionVerificationEmoji(symbol: "🦋", description: "Butterfly"),
+         SessionVerificationEmoji(symbol: "🎂", description: "Cake"),
+         SessionVerificationEmoji(symbol: "🎂", description: "Cake"),
+         SessionVerificationEmoji(symbol: "🏁", description: "Flag"),
+         SessionVerificationEmoji(symbol: "🌏", description: "Globe")
+        ]
+    }
+}