Symfony version(s) affected: 5.3

Description
According to this post, the Context annotation allows to add context per attribute.

If you look closely into the code though, you'll discover that

1. Upon normalization, the callbacks are only retrieved from the context passed explicitly to normalize() method:
   https://github.com/symfony/serializer/blob/5d7f068253ac3e7c62964ebdda491b06d401059a/Normalizer/AbstractObjectNormalizer.php#L187

2. Upon denormalization, either callbacks passed explicitly to denormalize() or passed as annotation, e.g.

/**
 * @Context({
 *     "denormalizationContext": { "callbacks": { "someValue": "doSomeStuffOnDenormalization" } }
 * })
 */
private int $someValue;

are completely ignored. (?)

https://github.com/symfony/serializer/blob/5d7f068253ac3e7c62964ebdda491b06d401059a/Normalizer/AbstractObjectNormalizer.php#L401

How to reproduce
Add Context annotation to an attribute, with callbacks for normalization / denormalization and see if they are actually called.

Possible Solution
Add the missing functionality