Revoke licenses by product key instead of shared sub.

Add revokedKeys storage and accept key in admin revoke API so DND/TTRPG keys with the same sub can be revoked independently.

Co-authored-by: Cursor <cursoragent@cursor.com>

data.example.json

@@ -9,5 +9,6 @@
     }
   ],
   "revokedSubs": [],
+  "revokedKeys": [],
   "activations": {}
 }