Add a `userLogLevel` section and for each user identifier add a `defaultLogLevel` and `categoryLogLevel`.

```json
{
    "awsCloudWatchLoggingPlugin": {
        "enable": true,
        "logGroupName": "<log-group-name>",
        "region": "<region>",
        "localStoreMaxSizeInMB": 1,
        "flushIntervalInSeconds": 60,
        "loggingConstraints": {
            "defaultLogLevel": "ERROR",
            "userLogLevel": {
                "xyz-123": {
                    "defaultLogLevel": "DEBUG",
                    "categoryLogLevel": {
                        "Storage": "VERBOSE",
                        "Api": "VERBOSE"
                    }
                }
            }
        }
    }
}
```
