Unify json and normal logger

[berendsliedrecht]

We can unify the json and normal logger so we just have one logger call and we can log the values for the normal logger and log the entire json when we have the --json flag enabled,

log!({
  "connection_id": "abc-def",
  "invitation_url": "https://..."
})

# Without flag
abc-def
https://...

# With flag
{
  "connection_id": "abc-def",
  "invitation_url": "https://..."
}

[morrieinmaas]

alos see discussion here