List codegen rulesets

Example response

{
  "data": [
    {
      "attributes": {
        "description": "A collection of Python best practice rules.",
        "name": "python-best-practices",
        "rules": [
          {
            "data": {
              "type": "rules"
            }
          }
        ],
        "short_description": "Python best practices ruleset."
      },
      "id": "python-best-practices",
      "type": "rulesets"
    }
  ]
}