Investigate supporting ably-js in laravel echo

[ably-sync-bot]

Currently we advise laravel users to use the pusher-js compatibility mode if they want to use ably with laravel. Pusher have changed their library/protocol recently so the ably laravel integration is currently broken. We should investigate adding explicit support for ably-js to https://github.com/laravel/echo so that we no longer depend on pusher-js.

┆Issue is synchronized with this Jira Research by Unito

[sacOO7]

Related to https://github.com/springboardVR/Laravel-Ably-Broadcaster, https://github.com/laravel/docs/pull/7130, https://github.com/laravel/docs/pull/7129

[sacOO7]

Pusher adapter with Ably -> https://faqs.ably.com/using-the-ably-pusher-protocol-adapter Setting up pusher-> https://ably.com/tutorials/pusher-adapter#setup-ably-account