Description

This PR introduces a new#[AsVoter] attribute that allows security voters to declare their priority directly within the class, as proposed in issue#43074.

Motivation

While#[AsTaggedItem] or#[Autoconfigure] can technically set voter priority, they require manually specifying tag names and options, making the configuration verbose, error-prone, and less intuitive.

The goal of#[AsVoter] is to simplify voter configuration and make it explicit, intuitive, and easy to use, following the pattern of other Symfony attributes such as#[AsEventListener].

The#[AsVoter] attribute provides:

• Clearer intent: Explicitly designed for security voters
• Better developer experience: More discoverable and easier to understand than generic tag configuration
• Consistency: Aligns with other component-specific attributes like#[AsCommand],#[AsEventListener],#[AsMessageHandler], etc.
• Foundation for future enhancements: Provides a dedicated attribute that can be extended with additional voter-specific configuration options in the future

Behavior

• The attribute can be added once per class
• The#[AsVoter] attribute overrides YAML configuration and other attributes (#[AsTaggedItem]#[Autoconfigure])
• This ensures the in-class configuration is always respected

Before

// config/services.yamlservices:    App\Security\Voter\PostVoter:        tags:            - { name: security.voter, priority:100 }

useSymfony\Component\DependencyInjection\Attribute\AsTaggedItem;#[AsTaggedItem('security.voter', ['priority' =>100])]class PostVoterimplements VoterInterface{publicfunctionvote(TokenInterface$token,mixed$subject,array$attributes):int    {// ...    }}

After

useSymfony\Component\Security\Core\Attribute\AsVoter;#[AsVoter(priority:100)]class PostVoterimplements VoterInterface{publicfunctionvote(TokenInterface$token,mixed$subject,array$attributes):int    {// ...    }}