Added the banned room proxy (#3744)

* added the banned room proxy

and a way to have a consistent loading + a retry alert

* trailing closure

* indent a comment

* push package.resolved

* updated test case

ElementX/Sources/Services/Room/BannedRoomProxy.swift

@@ -0,0 +1,38 @@
+//
+// Copyright 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
+
+class BannedRoomProxy: BannedRoomProxyProtocol {
+    private let roomListItem: RoomListItemProtocol
+    private let roomPreview: RoomPreviewProtocol
+    let info: BaseRoomInfoProxyProtocol
+    let ownUserID: String
+    
+    // A room identifier is constant and lazy stops it from being fetched
+    // multiple times over FFI
+    lazy var id = info.id
+        
+    init(roomListItem: RoomListItemProtocol,
+         roomPreview: RoomPreviewProtocol,
+         ownUserID: String) throws {
+        self.roomListItem = roomListItem
+        self.roomPreview = roomPreview
+        self.ownUserID = ownUserID
+        info = try RoomPreviewInfoProxy(roomPreviewInfo: roomPreview.info())
+    }
+    
+    func forgetRoom() async -> Result<Void, RoomProxyError> {
+        do {
+            return try await .success(roomPreview.forget())
+        } catch {
+            MXLog.error("Failed forgetting the room with error: \(error)")
+            return .failure(.sdkError(error))
+        }
+    }
+}