[wip] create websocket api

[EverlastingBugstopper]

this pr allows users of this library to connect to an arbitrary websocket and send/receive messages with the devtools protocol

beginning usage will hopefully look something like this

use chrome_devtools as cdp;

let socket_url = format!("wss://rawhttp.cloudflareworkers.com/inspect/{}", session_id);
let client = cdp::Client::new(&socket_url)?;
let connection = client.connect().await?;
connection.enable(cdp::Runtime).await?;