Add option to NewRemoteAllocator to avoid URL detection

[andyMrtnzP]

Summary

This PR solves issue #972. RemoteAllocatorOption was added, which contains FetchJSONDebuggerURL. This could avoid URL detection on NewRemoteAllocator. PersistDebuggerURL, an instance of RemoteAllocatorOption was added, with FetchJSONDebuggerURL as false.

Example

Consider connecting to a wss:// URL

func main() {
  var devToolWsUrl string
  var title string
  var opts = chromedp.PersistDebuggerURL
  var url = "wss://chrome.browserless.io?token=my_token_here"

  flag.StringVar(&devToolWsUrl, "devtools-ws-url", url, "DevTools Websocket URL")
  flag.Parse()

  actxt, cancelActxt := chromedp.NewRemoteAllocator(context.Background(), devToolWsUrl, opts)
  // works as well      chromedp.NewRemoteAllocator(context.Background(), devToolWsUrl, chromedp.RemoteAllocatorOption{ FetchJSONDebuggerURL: false })
  defer cancelActxt()

  ctxt, cancelCtxt := chromedp.NewContext(actxt) // create new tab
  defer cancelCtxt()                             // close tab afterwards

  if err := chromedp.Run(ctxt,
    chromedp.Navigate("https://example.com"),
    chromedp.Title(&title),
  ); err != nil {
    log.Fatalf("Failed getting title of example.com: %v", err)
  }

  log.Println("Got title: `" + title + "`")
}

will connect to the WebSocket and scrape the page correctly -- it currently does not connect and errs a HTTP 301

[ZekeLu]

We should stick with the functional options pattern. Refer to how ExecAllocatorOption is implemented.

[ZekeLu]

Closing in favor of #1184. Thank you!