Send edited messages support

Co-authored-by: Fedor Indutnyy <indutny@signal.org>

ts/util/canEditMessages.ts

@@ -0,0 +1,8 @@
+// Copyright 2023 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { isEnabled } from '../RemoteConfig';
+
+export function canEditMessages(): boolean {
+  return isEnabled('desktop.editMessageSend');
+}