Add lifecycle event for listen

Documentation shows a lifecycle event exists for `unlisten` on stores. It would be beneficial to also have the `listen` lifecycle event exposed.

Also some documentation on using lifecycle events in es5 would be helpful.

Start by reviewing the existing `unlisten` lifecycle event implementation and its documentation. Expose the corresponding `listen` lifecycle event and add documentation explaining lifecycle events in ES5; done means both requests are covered.

Written by the indexing model from the issue text.