fix: save connection url as class variable

[sirpy]

Changelog

[General] [Fixed] - WebSocket now exposes url on instance

Test Plan

Simply console.log connection.url it should equal the original url used to make the websockets connection

Summary

Conform with Websocket javascript api.
related to web3js issues: web3/web3.js#2864 web3/web3.js#2602

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[elicwhite]

It looks like the behavior on web is to provide this value:

> var connection = new WebSocket('wss://html5rocks.websocket.org/echo', ['soap', 'xmpp']);
> console.log(connection.url)
wss://html5rocks.websocket.org/echo

Can you update your PR following the recommendations from #27702 (comment)?

[sirpy]

@TheSavior
done

[ravi0the0sun]

hi is this PR going to be implemented as im having problems in my project as well

[luco]

Getting this as well.

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@TheSavior has imported this pull request. If you are a Facebook employee, you can view this diff on Phabricator.

[yungsters]

Closed via 8facc86.