Ability to log API response body

[kristofre]

We have had some challenges when downloading configuration where it is unable to parse the response body to JSON. It would therefor be great to be able to log the response code and body when supplying the MONACO_REQUEST_LOG=requests.log env var.

URL: [url]
METHOD: [method]
CONTENT:
[content]
RESPONSE:
[content]

[patrickpichler]

Since we are probably going to run requests in parallel in the near future,
I guess it would make sense to split the response off into its own file.

So you have a MONACO_RESPONSE_LOG env var which specifies the
file. Then we only need to generate an UUID so you can match request
and response.

[patrickpichler]

I implemented this in #219