Clean up \Drupal\hal\Normalizer\NormalizerBase: duplicate less from the parent class \Drupal\serialization\Normalizer\NormalizerBase

The \Drupal\serialization\Normalizer\NormalizerBase has the checkFormat() method which allows you to check whether data format is supported by this normalizer.

Proposed resolution

1. Rename property $formats of \Drupal\hal\Normalizer\NormalizerBase to $format.
2. Remove supportsNormalization() and supportsDenormalization() methods of the same class.
3. Explicitly define the $format property in \Drupal\serialization\Normalizer\NormalizerBase class to allow inheritance.