Configurable ws lives

[dkarella]

What does this PR do?

This PR adds a couple of changes for us to be able to test using WebSockets as the only transport mechanism without risk of falling into the unrecoverable "failed" state, and to gather more information about why and how often the connections drop to the fallback transport.

This change will more than likely not make it back into the official pusher-js repo, it's just meant for us to quickly test. As such, we should not merge this PR – it's just here for reviewing. Depending on what we find, a more flushed out change may come later.

Checklist

• All new functionality has tests.
• All tests are passing.
• New or changed API methods have been documented.
• npm run format has been run

CHANGELOG

• [CHANGED] made WebSocket lives configurable for the user
• [ADDED] optional reportDeathCallback to allow users to get information about why a transport mechanism lost a life
• [CHANGED] changed name of package to @goguardian/pusher-js

[SidneyNemzer]

Converted to draft as we do not intend to merge this (see description)