Change log data structure in frontend

[gky360]

Improved frontend performance by changing the data structure of logs.

In the future, another PR will change the data structure of logs on the server side. Afterward, logTransformMiddleware added temporarily in this PR can be removed because the server side returns logs with the new structure and data structure transformation in frontend will no longer be needed.

before

{
  "id": 60341,
  "logItems": [
    {
      "key": "epoch",
      "logId": 60341,
      "value": 232
    },
    ...,
    {
      "key": "validation/main/ap/train",
      "logId": 60341,
      "value": 0.8742285132142299
    }
  ],
  "resultId": 21
}

after

{
  "id": 60341,
  "resultId": 21,
  "logDict": {
    "epoch": 232,
    "lr": 0.000010000000000000003,
    "elapsed_time": 116463.71140658506,
    ...,
    "other1/loss/conf": 1.3967612981796265,
    "validation/main/ap/train": 0.8742285132142299
  }
}

[ofk]

Thank you!