Generate mocks for all SDK classes and introduce a simple TimelineItemFactory test to try them out

ElementX/Sources/Mocks/SDK/ClientMock.swift

@@ -1,21 +0,0 @@
-//
-// Copyright 2023 New Vector Ltd
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-//
-
-import Foundation
-import MatrixRustSDK
-
-// sourcery: AutoMockable
-protocol SDKClientProtocol: ClientProtocol { }