minor #936 PHP Attributes support in controllers (Rafikooo)

This PR was merged into the 1.12 branch.

Discussion
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This PR introduces PHP attribute handling in controllers

Reference: https://symfony.com/doc/current/routing.html#creating-routes-as-attributes

Since this branch supports `Sylius 1.12` and `Symfony 5.4.*`, the configuration had to be adjusted according to these docs:
https://symfony.com/doc/5.4/routing.html#creating-routes-as-attributes-or-annotations

Commits
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  Add PHP Attributes support in controllers

config/routes/annotations.yaml

@@ -0,0 +1,3 @@
+controllers:
+    resource: ../../src/Controller/
+    type: annotation