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/verify_database.go

@@ -1,13 +1,14 @@
 package initialise
 
 import (
-	"database/sql"
 	_ "embed"
 	"fmt"
 
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
 	"github.com/zitadel/logging"
+
+	"github.com/zitadel/zitadel/internal/database"
 )
 
 func newDatabase() *cobra.Command {
@@ -33,8 +34,8 @@ The user provided by flags needs priviledge to
 	}
 }
 
-func VerifyDatabase(databaseName string) func(*sql.DB) error {
-	return func(db *sql.DB) error {
+func VerifyDatabase(databaseName string) func(*database.DB) error {
+	return func(db *database.DB) error {
 		logging.WithFields("database", databaseName).Info("verify database")
 
 		return exec(db, fmt.Sprintf(string(databaseStmt), databaseName), []string{dbAlreadyExistsCode})