N°6414 Validator refactoring

New AbstractValidator class, with new method Validate
All existing validators are now children of AbstractRegexpValidator
Handle validators JS counterparts in renderers : only regexp validators are implemented client side

lib/composer/ClassLoader.php

@@ -149,7 +149,7 @@ class ClassLoader
 
     /**
      * @return string[] Array of classname => path
-     * @psalm-var array<string, string>
+     * @psalm-return array<string, string>
      */
     public function getClassMap()
     {