Feature proposal: Live update through websockets

Hi,

Since a pull request is going to [add unique ids to blocks](https://github.com/codex-team/editor.js/pull/925), I was thinking it could be used to make a plugin that could hook on all blocks update() and transmit through the network the delta.

My question is:
- Did you already think to something like this? (other editors like Slate handles it nativelly)
- If so, what would be the best API entry point/hook to do that? (I'm ok to spend some time on it).

Regards.