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/eventstore/handler/v2/state_get_await.sql

@@ -0,0 +1,12 @@
+SELECT
+    aggregate_id
+    , aggregate_type
+    , "sequence"
+    , event_date
+    , "position"
+FROM 
+    projections.current_states
+WHERE
+    instance_id = $1
+    AND projection_name = $2
+FOR UPDATE;