feat: account purge handler, tombstone cleanup, AP tombstone signing + 410

crates/application/tests/users.rs

@@ -20,6 +20,8 @@ mod get_profile_settings_test;
 mod get_settings_test;
 #[path = "users/get_users_test.rs"]
 mod get_users_test;
+#[path = "users/purge_account_test.rs"]
+mod purge_account_test;
 #[path = "users/request_account_deletion_test.rs"]
 mod request_account_deletion_test;
 #[path = "users/resolve_username_to_id_test.rs"]