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_domain.go

@@ -38,7 +38,7 @@ func (c *Commands) ChangeDefaultDomainPolicy(ctx context.Context, userLoginMustB
 	// returning the values of the first event as this is the one from the instance
 	return &domain.ObjectDetails{
 		Sequence:      pushedEvents[0].Sequence(),
-		EventDate:     pushedEvents[0].CreationDate(),
+		EventDate:     pushedEvents[0].CreatedAt(),
 		ResourceOwner: pushedEvents[0].Aggregate().ResourceOwner,
 	}, nil
 }