AC1. Convert amp-block-validation.js to an ES6 module
AC2. Create a new file that will import both this module and amp-block-editor-toggle.js (though that might have since been renamed). This can be similar to blocks/index.js.
AC3. Add that new file with the import statements to webpack.config.js, so it will be compiled with npm run dev
AC4. Ensure that the compiled files have sourcemaps.

This should probably wait for the work on amp-block-validation.js in #1293