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_set.sql

@@ -0,0 +1,29 @@
+INSERT INTO projections.current_states (
+    projection_name
+    , instance_id
+    , aggregate_id
+    , aggregate_type
+    , "sequence"
+    , event_date
+    , "position"
+    , last_updated
+) VALUES (
+    $1
+    , $2
+    , $3
+    , $4
+    , $5
+    , $6
+    , $7
+    , now()
+) ON CONFLICT (
+    projection_name
+    , instance_id
+) DO UPDATE SET
+    aggregate_id = $3
+    , aggregate_type = $4
+    , "sequence" = $5
+    , event_date = $6
+    , "position" = $7
+    , last_updated = statement_timestamp()
+;