System logs: Move request details out of summary column

The system logs have entries with a Summary value that looks like this:

```
Executed HTTP request: {
"requestId": "fa2a699d-cae9-4234-a456-3dc7f466f666",
"method": "GET",
"uri": "/api/HttpTriggerCSharp1",
"authorizationLevel": "Function"
}
```

It would be better if this was split across two columns e.g.

```
Summary Column
Executed HTTP request id "fa2a699d-cae9-4234-a456-3dc7f466f666"

Details Column
{
"requestId": "fa2a699d-cae9-4234-a456-3dc7f466f666",
"method": "GET",
"uri": "/api/HttpTriggerCSharp1",
"authorizationLevel": "Function"
}
```

This way you can do a parsejson(details) without having to do substring shenanigans