Description
Class BlockAttributeValidationEvents does not comply with psr-4 autoloading standard

Steps to reproduce
1. Run composer dump-autoload -o

Result:
Deprecation Notice: Class EzSystems\EzPlatformPageFieldType\FieldType\Page\Block\Definition\Event\BlockAttributeValidationEvents located in ./vendor/ezsystems/ezplatform-page-fieldtype/src/lib/FieldType/Page/Block/Definition/BlockAttributeValidationEvents.php does not comply with psr-4 autoloading standard. It will not autoload anymore in Composer v2.0. in phar:///usr/local/bin/composer/src/Composer/Autoload/ClassMapGenerator.php:201

Expected Result

Composer dump without any warring in our project