Add utility to wrap a WebSocket in a Duplex stream

[lpinca]

I'm not sure if it make sense to add this but reasons for doing it are:

• No additional dependencies.
• Functionality is strictly bound to the ws internals.
• Already existing modules are broken. The most popular, websocket-stream
  • Loses data
  • Does not properly handle backpressure

[lpinca]

@3rd-Eden PTAL.

[chainhead]

How do we read the stream into ws.send()?

This option keeps hitting the event emitter limit - not sure why.

duplex.on('data', (chunk) => {
  ws.send(chunk.toString())
}