[JMeter] Support json data in csv

[kannkyo]

Fix #8460

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[wing328]

@kannkyo thanks for the fix. I think one limitation with such approach is that if the json data contains ', e.g.

{
  "name": "John O'Shea"
}

the result will not work as it will become:

{
  "name": "John O"Shea"
}

I'm happy to merge this fix while looking for better approach to address cases like the above.