Feature Request: Add dynamic data

[MarkoH17]

First off, thank you for such a great project!

I have a use case where I would like to push new events to an already-mounted asciinema-player instance. I understand that I can use the websocket driver to stream events, but I think it would be useful to expose an API where data events could be pushed, something like:

let domElement = document.getElementById("#someId");
let playerInstance = AsciinemaPlayer.create({ data: [...] }, domElement);

this.domElement.on('my-custom-data-event', (event) => {
  let newEvents = event.myCustomEvents; // myCustomEvents = [[timestamp_delta, mode, content]]

  this.playerInstance.appendEvents(newEvents);
})

The docs indicate that data can be "dynamically loaded", yet it appears that this only occurs when playing begins.

If exposing an API to append data to an existing stream isn't possible, would you consider allowing custom drivers to be specified during initialization so custom data loading behavior can be used?