Update annotations for plugins

It should be possible to add labels and descriptions to all FapiValidationFilter & FapiValidationValidator plugins.

Requirements:
1. Updated annotation classes with new properties.
2. Implement new methods in base plugins to get annotation values.
e.g. public function label() { return $this->getPluginDefinition()['label']->__toString(); }
3. Update all plugins with labels and descriptions.

IMPORTANT: the issue is added for the 'Global Contribution Weekend' on 25.01.2025. Please, don't work on it till that date.