Allow to get taxons from specific taxonomy

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | yes
| Deprecations? | no
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Introduce ``TaxonsAwareInterface`` and allow to get taxons from specific taxonomy.
Are you sure? It seems like its just copied from `src/Sylius/Component/Core/Model/ProductInterface.php`