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.

cmd/setup/15/cockroach/05_current_states.sql

@@ -0,0 +1,15 @@
+CREATE TABLE IF NOT EXISTS projections.current_states (
+    projection_name TEXT NOT NULL
+    , instance_id TEXT NOT NULL
+
+    , last_updated TIMESTAMPTZ
+
+    , aggregate_id TEXT
+    , aggregate_type TEXT
+    , "sequence" INT8
+    , event_date TIMESTAMPTZ
+    , "position" DECIMAL
+
+    , PRIMARY KEY (projection_name, instance_id)
+);
+CREATE INDEX IF NOT EXISTS cs_instance_id_idx ON projections.current_states (instance_id);