feat(wrangler): allow to output pages deployments in JSON

[mlafeldt]

What this PR solves / how to test

This makes it possible to further process the output of wrangler pages deployment list, e.g. like this

$ wrangler pages deployment list --project-name example --format json | jq .[0]
{
  "environment": "Production",
  "branch": "main",
  "source": "f4c86e5",
  "deployment": "https://0d903966.example.pages.dev",
  "status": "13 minutes ago",
  "build": "https://dash.cloudflare.com/..."
}

In general, I've found the command's default table output to be barely readable as it wraps lines and shortens column fields, even on my MacBook Pro's high-res monitor.

refs #2012

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[changeset-bot]

⚠️ No Changeset found

Latest commit: 4494416

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[mlafeldt]

We might prefer --json over --format json, though wrangler is not consistent when it comes to flags.

[penalosa]

This looks great, thank you! This will need tests, and should use the --json flag rather than --format json

[penalosa]

Closing this for now, since we haven't heard from you in a while. We'd be happy to accept a PR for this feature though, feel free to open a new one with associated tests and I can make sure it gets merged and released!