add NSE sources to EX project to easily implement mocking and allow the code to be unit tested

NSE/Sources/NotificationItemProxy/NotificationItemProxyProtocol.swift

@@ -0,0 +1,48 @@
+//
+// Copyright 2025 Element Creations Ltd.
+// Copyright 2022-2025 New Vector Ltd.
+//
+// SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial.
+// Please see LICENSE files in the repository root for full details.
+//
+
+import Foundation
+import MatrixRustSDK
+import UserNotifications
+
+// sourcery: AutoMockable
+protocol NotificationItemProxyProtocol {
+    var event: NotificationEvent? { get }
+    
+    var senderID: String { get }
+
+    var roomID: String { get }
+
+    var receiverID: String { get }
+
+    var senderDisplayName: String? { get }
+
+    var senderAvatarMediaSource: MediaSourceProxy? { get }
+
+    var roomDisplayName: String { get }
+
+    var roomAvatarMediaSource: MediaSourceProxy? { get }
+
+    var roomJoinedMembers: Int { get }
+
+    var isRoomDirect: Bool { get }
+    
+    var isRoomPrivate: Bool { get }
+
+    var isNoisy: Bool { get }
+
+    var hasMention: Bool { get }
+    
+    var threadRootEventID: String? { get }
+}
+
+extension NotificationItemProxyProtocol {
+    var isDM: Bool {
+        isRoomDirect && roomJoinedMembers <= 2
+    }
+}