feat: Introduce #[AsFixture] attribute and foundry:load-fixture command

[nikophil]

fixes #898

⚠️ I made a mistake with git, follow up in #903

[kbond]

This is great!

From a DX perspective, I'd really like:

1. When you install foundry, the recipe creates an AppStory (like the doctrine-fixtures recipe does)
2. Just run bin/console foundry:load-stories (no arguments)

So, what do you think about: if you pass the command no args and there's only one services tagged #[AsFixture], load that one?

[nikophil]

From a DX perspective, I'd really like:

• When you install foundry, the recipe creates an AppStory (like the doctrine-fixtures recipe does)
• run bin/console foundry:load-stories (no arguments)

So, what do you think about: if you pass the command no args and there's only one services tagged #[AsFixture], load that one?

💯