Generating SDK Mocks through the usage of swift run tools generate-sdk-mocks (#982)

* basic implementation, that works for now only with the local SDK

* replaced a handmade mock with a generated mock

ElementX/Sources/Mocks/SDK/ClientMock.swift

@@ -0,0 +1,21 @@
+//
+// 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 { }