Add option to ignore method when resolving subscriptions

[Brajk19]

When using the ForGroups target for a serialization group that is defined for a method not linked to a specific property, such as:

#[Groups('common')]
public function getType(): string
{
    return 'some string';
}

an error occurs during compilation. This happens because Purgatory is unable to resolve properties affected by this method.

In cases where a method accesses properties, this behavior is expected, and the #[TargetedProperties] attribute should be applied to indicate which properties are used by the method. However, even when a method returns data unrelated to any properties, the error is still triggered (which is not good).

One workaround is to use a placeholder #[TargetedProperties] attribute with an existing property for that serialization group, like so:

#[Groups('common')]
#[TargetedProperties('name')]
public function getType(): string
{
    return 'some string';
}

However, this is not ideal. I propose introducing a new attribute (#[DoesNotAccessProperties]?) to signal that the method does not interact with any properties and should therefore be exempt from this validation.

#[Groups('common')]
#[DoesNotAccessProperties]
public function getType(): string
{
    return 'some string';
}