[CodeQuality] Add rule to replace in-string classes

[TomasVotruba]

Similar to: https://github.com/rectorphp/rector/blob/master/docs/rector_rules_overview.md#splitstringclassconstanttoclassconstfetchrector

>write(
-                '<?php if (App\SomeClass::createCache($netteCacheStorage, %var,  $this->global->cacheStack, %node.array?)) { ?>',
+                '<?php if (' . SomeClass::class . '::createCache($netteCacheStorage, %var,  $this->global->cacheStack, %node.array?)) { ?>',
                \md5($node->args)
            );

Just for classes in String_ node