feat(eventstore): increase parallel write capabilities (#5940)

This implementation increases parallel write capabilities of the eventstore.
Please have a look at the technical advisories: [05](https://zitadel.com/docs/support/advisory/a10005) and  [06](https://zitadel.com/docs/support/advisory/a10006).
The implementation of eventstore.push is rewritten and stored events are migrated to a new table `eventstore.events2`.
If you are using cockroach: make sure that the database user of ZITADEL has `VIEWACTIVITY` grant. This is used to query events.

cmd/setup/10/10_fill_table.sql

@@ -10,6 +10,8 @@ INSERT INTO wrong_events (
             ) AS next_cd
         FROM
             eventstore.events
+        WHERE
+            "position" IS NULL
     ) sub WHERE
         current_cd < next_cd
     ORDER BY