Introduce hook_entity_access() and hook_entity_create_access()

Any entity access control handler that extends \Drupal\Core\Entity\EntityAccessControlHandler will now invoke hook_entity_access() and hook_entity_create_access() next to hook_ENTITY_TYPE_access() and hook_ENTITY_TYPE_create_access(). To check the entity type in hook_entity_access(), call $entity->entityType(). See entity.api.php the hooks' arguments and return values.

Example:

use Drupal\Core\Entity\EntityInterface;
use Drupal\Core\Session\AccountInterface;

/**
 * Implements hook_entity_access().
 */
function hook_entity_access(EntityInterface $entity, $operation, AccountInterface $account, $langcode) {
  $entity_types = array('foo', 'bar');
  if (in_array($entity->entityType(), $entity_types)) {
    return TRUE;
  }
  return NULL;
}

/**
 * Implements hook_entity_create_access().
 */
function hook_entity_create_access(AccountInterface $account, $langcode, $entity_bundle) {
  if ($account->hasPermission('foo')) {
    return TRUE;
  }
  return NULL;
}