Websocket - cycles events

[cryi]

Adds SubscribeToCycle. Meant to be used in tools like Breadcrumbs where head updates are unnecessary.

[cryi]

Hey @Groxan,
I just realized that for our use case it does make sense only report completed cycles. It is easy to change this to completed cycles but I wonder you can see some use case where it makes sense to report cycle which is in progress. If so should I create separate processor or report both completed cycle and new cycle or switch through parameter.

Nvm, there are not that important data in the Cycle anyway. We will just fetch needed data when notified. So from our side this is ok.

[cryi]

Tested on ghostnet. All good.