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/config.go

@@ -2,25 +2,11 @@ package eventstore
 
 import (
 	"time"
-
-	"github.com/zitadel/zitadel/internal/database"
-	"github.com/zitadel/zitadel/internal/eventstore/repository"
-	z_sql "github.com/zitadel/zitadel/internal/eventstore/repository/sql"
 )
 
 type Config struct {
-	PushTimeout              time.Duration
-	Client                   *database.DB
-	AllowOrderByCreationDate bool
+	PushTimeout time.Duration
 
-	repo repository.Repository
-}
-
-func TestConfig(repo repository.Repository) *Config {
-	return &Config{repo: repo}
-}
-
-func Start(config *Config) (*Eventstore, error) {
-	config.repo = z_sql.NewCRDB(config.Client, config.AllowOrderByCreationDate)
-	return NewEventstore(config), nil
+	Pusher  Pusher
+	Querier Querier
 }