You have requested a non-existent service "path.alias_storage"

Problem/Motivation

Drupal 9 has removed the service 'path.alias_storage' and have been reverted to revisionable entities, see link to drupal 9 documentation.

Steps to reproduce

1. Enable the current tombstone module, configure it to delete any content type
2. Create a dummy content type of the type set above and then proceed to delete it
3. Webpage will white screen and the error in the log will be something along the line of "You have requested a non-existent service "path.alias_storage". in Drupal\Core\Entity\Sql\SqlContentEntityStorage->delete() "

Proposed resolution

Following the instructions here, the following code/patch is proposed to allow for tombstones to work with Drupal 9

diff --git a/src/TombstonesService.php b/src/TombstonesService.php
index 5afcae4..f080092 100644
--- a/src/TombstonesService.php
+++ b/src/TombstonesService.php
@@ -58,7 +58,14 @@ class TombstonesService {
       'field_tombstone_path' => $tombstone_metadata['path'],
     ]);
     $tombstone->save();
-    \Drupal::service('path.alias_storage')->save("/node/" . $tombstone->id(), $tombstone_metadata['path'], "en");
+    
+    $path_alias = \Drupal::entityTypeManager()->getStorage('path_alias')->create([
+      'path' => "/node/" . $tombstone->id(),
+      'alias' => $tombstone_metadata['path'],
+      'langcode' => "en",
+    ]);
+    $path_alias->save();
+    \Drupal::entityTypeManager()->getStorage('path_alias')->save($path_alias);
   }
 
 }

Thanks!