Show a warning dialog when sending first edited message

ts/util/maybeBlockSendForEditWarningModal.ts

@@ -0,0 +1,10 @@
+// Copyright 2023 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { explodePromise } from './explodePromise';
+
+export async function maybeBlockSendForEditWarningModal(): Promise<boolean> {
+  const explodedPromise = explodePromise<boolean>();
+  window.reduxActions.globalModals.showSendEditWarningModal(explodedPromise);
+  return explodedPromise.promise;
+}