Implement codeclimate reporter

[andrei-stsiapanau]

It is nice to have Codeclimate reporter plugin to be able to integrate codesniffer with gitlab-ci.

[jrfnl]

@Stephanoff Could you elaborate a little on what you mean by this ? Maybe add some links too ?

[andrei-stsiapanau]

There is existing tool called Codeclimate used for the GitLab CI AutoDevOps.
There is an example their report implementation https://github.com/codeclimate/codeclimate-phpcodesniffer
But running Codeclimate on the large project is not an option since common case is use PHPCS installed from composer.
I didn't happy about their approach hardcoding report generator inside their package.

[jrfnl]

@Stephanoff Ah, I understand now and I agree it would be better to have a report type for that, but that doesn't necessarily have to be in PHPCS itself and as your PR contains hard-coded sniff names and such which would need regular maintenance and is tied into the composer.json for CodeClimate, I'm wondering if it wouldn't be better to pull your report to the CodeClimate repo ?

An external repo can use their own report by name. See #1942 and #1948 for how to implement this.

[andrei-stsiapanau]

Great, thank you!
Will do it as a separate reporter. I am not sure about integrating this reporter into CodeClimate, will ask them.