Deployment events over websockets

[david-castaneda]

Implement a solution for emitting deployment events over websockets.

It should emit events for the different steps of a deployment providing clients (ie. CLI) current deployment details via events.

There is a branch with an early implementation of emitting deployment events, most of the websocket part is done, the business logic is what needs to be defined

Example:

$ krane deploy -f ./deployment.json
Pulling biensupernice/soulector...
Creating 3 containers...
Starting 3 containers...
Checking containers health...
Deployment successfully completed

[david-castaneda]

Implementation for event emitters can be found here https://github.com/krane/krane/blob/master/internal/deployment/events.go#L39