Issue #2821009 by ZeiP, quietone, Dinesh18, shashikant_chauhan, chx, joachim,...

   * Checks access to the entity operation on the given route.

   *

   * The route's '_entity_access' requirement must follow the pattern

   * 'entity_stub_name.operation', where available operations are:

   * 'view', 'update', 'create', and 'delete'.

   * 'slug.operation'. Typically, the slug is an entity type ID, but it can be

   * any slug defined in the route. The route match parameter corresponding to

   * the slug is checked to see if it is entity-like, that is: implements

   * EntityInterface. Available operations are: 'view', 'update', 'create', and

   * 'delete'.

   *

   * For example, this route configuration invokes a permissions check for

   * 'update' access to entities of type 'node':

   *       example:

   *         type: entity:{entity_type}

   * @endcode

   * The route match parameter corresponding to the stub name is checked to

   * see if it is entity-like i.e. implements EntityInterface.

   *

   * @see \Drupal\Core\ParamConverter\EntityConverter

   *

   *

   * @return \Drupal\Core\Access\AccessResultInterface

   *   The access result.

   *

   * @link https://www.drupal.org/docs/8/api/routing-system/parameters-in-routes

   */

  public function access(Route $route, RouteMatchInterface $route_match, AccountInterface $account) {

    // Split the entity type and the operation.