Classes with Abstract prefix should be abstract

[OndraM]

Thanks to great https://github.com/Symplify/CodingStandard#abstract-class-should-have-prefix-abstract we check whether classes declared abstract do have Abstract prefix. But it could be nice to check also the "opposite way", ie. the classes starting with Abstract are in fact declared as abstract.

// @TomasVotruba didn't you heard of such fixer? Maybe it already exists somewhere 🤔?

[TomasVotruba]

I see. AFAIK such rule doesn't exists in sniff/fixer.

It should be rather sniff, right? So this code is not broken:

 <?php

-class AbstractClass
+abstract class AbstractClass
 {
 } 

 new AbstractClass;

Do you plan something similar verification for *Interface or *Trait naming?