Implement --no-diffs CLI Option

[staabm]

replicated the rector implementation of --no-diffs 1:1

closes #191

$ time php ../easy-coding-standard/bin/ecs check

**... snip walls of text of diff**
                                                                                                                        
 [WARNING] 885 errors are fixable! Just add "--fix" to console command and rerun to apply.                              

real    0m50.121s
user    0m0.000s
sys     0m0.000s

$ time php ../easy-coding-standard/bin/ecs check --no-diffs
 890/890 [============================] 100%

                                                                                                                        
 [WARNING] 885 errors are fixable! Just add "--fix" to console command and rerun to apply.                              


real    0m42.911s
user    0m0.015s
sys     0m0.000s
`` 

[TomasVotruba]

Thank you 👍

[staabm]

thank you guys for review and merging. I don't plan any more changes as all low hanging fruits have been adressed.

would be great to see a release with the recent changes :-)

[samsonasik]

@staabm easy-coding-standard 12.2.0 tagged https://github.com/easy-coding-standard/easy-coding-standard/releases/tag/12.2.0