feat: print matched error logs as json if requested

[fionera]

Previously the json handler would only wrap the message in a json object. This now replaces that message with an embedded object that contains all the information.

Thanks to @superstes for implementing this in his fork

[fzipi]

Should we add tests?

[hedgieinsocks]

Maybe we could abc sort the keys in the code? Right now, errorLog struct and marshalling use different key orders, which creates a small visual confusion. As for tests, the whole project has only the e2e test, so maybe adding unit tests (if they make sense) could be done in a separate contribution?

[hedgieinsocks]

@fionera just poking you to push this through as I want to see 1) 0.4.0 released right after that with a semver image 2) be able to finally build grafana dashboard from elastic json fields :D

[fionera]

Sorting makes no sense as this is not targeted to be human readable. Tests would be something we have to add in general, so yeah I would just keep it as this is.

[hedgieinsocks]

I meant sorting keys or at least making them in identical order in the code to make it predictable and readable development-wise. Cause I wanted to raise a comment about a missing key but later saw it present in another place. Also, I think we are missing phase key here.