Add #[Story] and #[Factory] attributes

[nikophil]

The main motivation behind this would be to be able to load factories and stories once in a class:

#[Story(MyStory::class)] // will be called for the test case
public function testSomething(): void

#[Story(MyStory::class)] // will be called once for the test class
class SomeTest extends TestCase {}

The main blocker here is to not reset database between tests: maybe we could do this for ResetDatabaseTrait but we'd certainly need to wait for phpunit 10 event's system to implement the feature with dmaicher/doctrine test-bundle