"gcode_store" Add posibility to subscribe on changes via websockets

[andsol]

I would like to subscribe on all incoming gcode commands which are getting added to "gcode_store" and receive them via websockets live.
According to API documentation: https://moonraker.readthedocs.io/en/latest/web_api/?h=gcode_store#request-cached-gcode-responses realtime monitoring not possible.