Issue #2036925 followup by japerry: Namespace the table module for compatability with migrate plus.

migrations/d7_captcha_sessions.yml

@@ -16,7 +16,7 @@ process:
   status: status
   attempts: attempts
 destination:
-  plugin: table
+  plugin: captcha_table
   table_name: captcha_sessions
   id_fields:
     csid:

src/Plugin/migrate/destination/Table.php

@@ -68,7 +68,7 @@ use Symfony\Component\DependencyInjection\ContainerInterface;
  * @endcode
  *
  * @MigrateDestination(
- *   id = "table"
+ *   id = "captcha_table"
  * )
  */
 class Table extends DestinationBase implements ContainerFactoryPluginInterface, ImportAwareInterface {