[TS] socket.send / socket.write arguments

[SonahtQ]

Describe the bug
Recently engine.io got whole new typescript code, but there are places that need for fixes.
One of it are arguments in Socket methods send and write.

send(data: any, options: any, callback?: any): this

As You can see argument options isn't optional, even that in method's body code suggets that it is: options = options || {}

A lot of projects sends data just by using socket.send(data), without any additional options, but now typescript shows error on these lines.

Engine.IO server version: 6.2.0

Solution
All we need is change options argument to be optional in methods send & write for Socket class.

[darrachequesne]

Added in 6d87a40. Thanks for the heads-up!