[ECO-2105] Add ws server

[CRBl69]

This PR adds a Websocket server to the processor so that it can send events to brokers.

[xbtmatt]

Awesome, thanks for knocking this out, looks good to me so far

Just noting here the two things we discussed on call:

1. Emit the events as the coupled data, in the processor they're all vectors suffixed with _db, we send them into insert_to_db(...):

  &register_events_db,
  &swap_events_db,
  &chat_events_db,
  &liquidity_events_db,
  &periodic_state_events_db,
  &global_state_events_db,

2. Also emit the market_latest_state_events, which will be the equivalent of the old latest_state_event emission we did for bump order, for example
3. Eventually we'd like to decouple the websocket server status from the processor itself, that way if it crashes/errors it can just restart and not stop the processor as well. That can be for another PR, will note it in a task