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.

internal/command/instance_policy_security.go

@@ -23,7 +23,7 @@ func (c *Commands) SetSecurityPolicy(ctx context.Context, enabled bool, allowedO
 	}
 	return &domain.ObjectDetails{
 		Sequence:      events[len(events)-1].Sequence(),
-		EventDate:     events[len(events)-1].CreationDate(),
+		EventDate:     events[len(events)-1].CreatedAt(),
 		ResourceOwner: events[len(events)-1].Aggregate().InstanceID,
 	}, nil
 }