nomad operator raft _logs doesn't stream logs

[tgross]

The "hidden" command nomad operator raft _logs reads the raft logs into memory before encoding the whole blob as JSON. This makes it unusable for operators of very large clusters with 10's of GB of raft logs in flight. Modify the command to stream the logs into the JSON encoder.

(I'm torn on bug vs enhancement on this one... call it a bughancement 😀 )

[tgross]

@davemay99 has noted this also applied to operator snapshot state. But that's going to be a much bigger lift because streaming the output is somewhat at odds with how the snapshot commands work -- they restore the entire FSM. I'll break that out to another issue. Edit: #11685

[github-actions]

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