Handle response when http_component is set and include logging of x-fb-debug, x-fb-rev

[pri1012]

Description:

This PR includes changes which will help use the latest koala version when http_component is set

Changes included:

• Parsing of response: when http_component is set, we receive Koala::Http_service response instead of a hash and generate_results method handles only JSON response. This affects all batch request.
• include x-fb-trace-id and x-fb-debug x-fb-rev as part of the error_message returned

[X] My PR has tests and they pass!

[codealchemy]

@ylecuyer bumping this for consideration when you have a moment 🙏

[ylecuyer]

I checked the code and the PR is mixing 3 things afaics. Would you mind splitting it and making on per per change, namely:

1. adding a new http_component that would return the body of the response
2. adding the new debug headers
3. returning custom error when the body is nil

this way review will be easier and changes will appear clearly in the changelog

[pri1012]

@ylecuyer
1 & 3 : #685, 2 separate commits
2: #686

cc @codealchemy

[pri1012]

@ylecuyer I have now fixed the failing units tests. Could you please help review the below PRs.

1. Add new http_component that would return the body of the response and custom error messages. #685
   2: Include logging of x-fb-debug, x-fb-rev #648 #686
   cc @arsduo