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.

e2e/config/localhost/docker-compose.yaml

@@ -32,7 +32,7 @@ services:
 
   db:
     restart: 'always'
-    image: 'cockroachdb/cockroach:v22.2.2'
+    image: 'cockroachdb/cockroach:v22.2.10'
     command: 'start-single-node --insecure --http-addr :9090'
     healthcheck:
       test: ['CMD', 'curl', '-f', 'http://localhost:9090/health?ready=1']

e2e/config/localhost/zitadel.yaml

@@ -8,6 +8,9 @@ Database:
   cockroach:
     # This makes the e2e config reusable with an out-of-docker zitadel process and an /etc/hosts entry
     Host: host.docker.internal
+    EventPushConnRatio: 0.2
+    MaxOpenConns: 40
+    MaxIdleConns: 20
 
 TLS:
   Enabled: false