Group violations per rule in output

[annervisser]

Feature Request

Q	A
New Feature	yes
RFC	yes
BC Break	no

Summary

Currently the output of violations is grouped by class (fqcn), and all violations are listed under that. If violations were additionally grouped per rule, this could add to the clarity of the output AND reduce the line-length by splitting into more lines.

The output would look something like this:

App\Domain\Model has 2 violations:
  violated rule: should not depend on classes outside namespace App\Domain because we want protect our domain
    - App\Domain\Model depends on App\Services\UserService (on line 14)
    - App\Domain\Model depends on App\Services\OtherService (on line 26)
  violated rule: should implement EntityInterface

This idea came up in discussion in this PR: #281 (comment)

I'd be able to pick this up and create a pull request when I have some spare time if this is a wanted feature

[AlessandroMinoccheri]

Thanks @annervisser, let me know if you need some help!

[dbu]

is this the same request as #187 ?

[AlessandroMinoccheri]

Yes @dbu it seems the same request!