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/initialise/helper.go

@@ -1,13 +1,13 @@
 package initialise
 
 import (
-	"database/sql"
 	"errors"
 
 	"github.com/jackc/pgconn"
+	"github.com/zitadel/zitadel/internal/database"
 )
 
-func exec(db *sql.DB, stmt string, possibleErrCodes []string, args ...interface{}) error {
+func exec(db *database.DB, stmt string, possibleErrCodes []string, args ...interface{}) error {
 	_, err := db.Exec(stmt, args...)
 	pgErr := new(pgconn.PgError)
 	if errors.As(err, &pgErr) {