Standard output format for query ledger-peer-snapshot command

[newhoggy]

Changelog

- description: |
    Standard output format for `query ledger-peer-snapshot` command
    Supports `--output-json`, `--output-json-pretty` and `--output-yaml`
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Context

Follows ADR-012

How to trust this PR

Highlight important bits of the PR that will make the review faster. If there are commands the reviewer can run to observe the new behavior, describe them.

Checklist

• Commit sequence broadly makes sense and commits have useful messages
• New tests are added if needed and existing tests are updated. See Running tests for more details
• Self-reviewed the diff

[crocodile-dentist]

Perhaps json pretty format should be the default when outputting to a file, and otherwise plain json to the terminal.

[carbolymer]

Why do we need output-json-pretty?

What do you think about defaulting to pretty JSON everywhere? If the produced data is large, let's add CBOR output format as well, in case a faster and more efficient format is needed.

[carbolymer]

Where is this used?

[newhoggy]

I must have backed out the change that used it.