feat: Add 'connecting' event

[tommoor]

As described in the comment here, a "connecting" event is useful for monkey-patching the authentication process in lieu of a more official API.

Seems like this is a no-brainer addition even if a more official auth API gets built on the client

_{Huly®: YJS-781}

[tommoor]

Could we get a release with this and the other couple of fixes? 🥺

[tommoor]

I've published a fork for anyone that wants this functionality: @tommoor/y-websocket@1.3.6

[prosperi]

I tried to replicate authentication flow that is described here. I am trying to monkey patch onmessage and onopen functions. It works fine for the initial connection, but on a server crash it has a problem with reconnection. I believe since the connecting status gets emitted before onmessage and onopen initialization, the connecting event handler gets called with provider.ws having onmessage and onopen set to undefined. Seems to work fine if I were to move emit part at the end of setupWS.

[tommoor]

Yep, I had the same thing – there's a PR in for it here:
#38

I published the fix to my fork already v1.3.7.