query config diff between current cluster and target upgrade version

Example response

{
  "data": {
    "configDiffInfos": [
      {
        "category": "basic",
        "currentValue": "20",
        "description": "desc for max-merge-region-size",
        "instanceType": "pd-server",
        "name": "max-merge-region-size",
        "paramId": "1",
        "range": [
          "1",
          " 1000"
        ],
        "rangeType": 1,
        "suggestValue": "30",
        "unit": "MB",
        "unitOptions": [
          "KB",
          "MB",
          "GB"
        ]
      }
    ]
  }
}