jsonlines support in "flyctl logs"

We are doing less JSON in flyctl these days, so I think it’s unlikely.

I think your best bet is to subscribe to the NATS log stream (like flyctl does).

Now that I wrote this all out, though, I’d be ok with a PR to [flyctl](https://github.com/superfly/flyctl) that adds a fly logs --raw and just prints the NATs bodies to stdout. It is not a bad idea, I just don’t know when we’ll get to it!