* Output Action Cable JS without transpiling and as ESM

* Retain umd version under the old name, generate ESM version + duplicate under new name

* Precompile JavaScripts for direct asset pipeline use

* We've dropped support for IE11

* Include deprecation notice for the old file reference

Thanks @rafaelfranca 👍

* Allow app to opt out of precompiling actioncable js assets

cc @rafaelfranca

* Add changelog entries