New Report for Github Actions

[MisterIcy]

Currently, in order to annotate a github PR with errors produced by phpcs, one has to use a 3rd party tool (such as cs2pr). This PR a new Report is implemented in order for phpcs to print errors and warnings (documentation) in the format needed by Github to add annotations in PRs and eliminates the need using a 3rd party tool.

It also adds the new, github, report in the help message.

[jrfnl]

Duplicate of #2918