[Serializer] Throw exception when unable to normalize embedded object

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets |
| License       | MIT
| Doc PR        |

This PR intends to prevent Fatal Error about calling undefined method `normalize()` on object `$serializer` in the `GetSetMethodNormalizer` when injected serializer does not implement the `NormalizerInterface`.