Callable rule attribute interface

Callable rule class may look like this:

final class MyRule {
    public function __invoke(mixed $value, object $rule, ValidationContext $context): Result {
        // ...
    }
}

For simple custom rules is good solution, but there is one problem. It is not possible usage as attribute.

We can add attribute Attribute:

#[Attribute(Attribute::TARGET_CLASS | Attribute::TARGET_PROPERTY | Attribute::IS_REPEATABLE)]
final class MyRule {
    // ...

It's not enough, because validator parse attributes that implement RuleInterface only.

Suggest add new interface CallableRuleAttributeInterface and parse implementing its attributes in addition to RuleInterface.

The issue names no files or tests. Start by tracing the validator's attribute parsing and its checks for RuleInterface, then review the callable rule shape shown in the issue. Done means callable rule attributes are recognized alongside RuleInterface attributes, including the proposed repeatable class and property usage.