Change error code in JSON to Int

[Aiee]

1. Change error code in JSON to In
2. Correct JSON format:

{
  "results": [
    {
      "columns": [],
      "data": [
        {
          "row": [
            "row-data"
          ],
          "meta": [
            "metadata"
          ]
        }
      ],
      "latencyInUs": 0,
      "spaceName": "",
      "planDesc ": {
        "planNodeDescs": [
          {
            "name": "",
            "id": 0,
            "outputVar": "",
            "description": {
              "key": ""
            },
            "profiles": [
              {
                "rows": 1,
                "execDurationInUs": 0,
                "totalDurationInUs": 0,
                "otherStats": {}
              }
            ],
            "branchInfo": {
              "isDoBranch": false,
              "conditionNodeId": -1
            },
            "dependencies": []
          }
        ],
        "nodeIndexMap": {},
        "format": "",
        "optimize_time_in_us": 0
      },
      "comment ": ""
    }
  ],
  "errors": [
    {
      "code": 0,
      "message": ""
    }
  ]
}

3. Make the JSON in the comment look nicer.

[codecov-commenter]

Codecov Report

Merging #2926 (0362474) into master (dddf54e) will decrease coverage by 0.71%.
The diff coverage is 63.00%.

@@            Coverage Diff             @@
##           master    #2926      +/-   ##
==========================================
- Coverage   85.47%   84.75%   -0.72%     
==========================================
  Files        1229     1231       +2     
  Lines      110375   110807     +432     
==========================================
- Hits        94341    93915     -426     
- Misses      16034    16892     +858     

Impacted Files	Coverage Δ
src/clients/meta/MetaClient.h	92.30% <ø> (ø)
src/common/utils/NebulaKeyUtils.cpp	89.03% <0.00%> (-4.89%)	⬇️
src/common/utils/NebulaKeyUtils.h	78.02% <ø> (ø)
src/graph/planner/plan/Admin.cpp	54.23% <0.00%> (-2.40%)	⬇️
src/graph/planner/plan/PlanNode.h	80.00% <ø> (ø)
src/graph/service/PermissionCheck.cpp	83.72% <ø> (+2.32%)	⬆️
src/kvstore/KVEngine.h	100.00% <ø> (ø)
src/kvstore/RocksEngine.cpp	81.79% <0.00%> (-1.73%)	⬇️
src/kvstore/RocksEngine.h	66.66% <0.00%> (-25.00%)	⬇️
src/meta/MetaServiceHandler.h	100.00% <ø> (ø)
... and 121 more

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[yixinglu]

LGTM