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/statement.go

@@ -2,77 +2,8 @@ package handler
 
 import (
 	"database/sql"
-	"encoding/json"
-	"errors"
-	"github.com/zitadel/logging"
-
-	"github.com/zitadel/zitadel/internal/eventstore"
 )
 
-var (
-	ErrNoProjection    = errors.New("no projection")
-	ErrNoValues        = errors.New("no values")
-	ErrNoCondition     = errors.New("no condition")
-	ErrSomeStmtsFailed = errors.New("some statements failed")
-)
-
-type Statements []Statement
-
-func (stmts Statements) Len() int           { return len(stmts) }
-func (stmts Statements) Swap(i, j int)      { stmts[i], stmts[j] = stmts[j], stmts[i] }
-func (stmts Statements) Less(i, j int) bool { return stmts[i].Sequence < stmts[j].Sequence }
-
-type Statement struct {
-	AggregateType    eventstore.AggregateType
-	Sequence         uint64
-	PreviousSequence uint64
-	InstanceID       string
-
-	Execute func(ex Executer, projectionName string) error
-}
-
-func (s *Statement) IsNoop() bool {
-	return s.Execute == nil
-}
-
 type Executer interface {
 	Exec(string, ...interface{}) (sql.Result, error)
 }
-
-type Column struct {
-	Name         string
-	Value        interface{}
-	ParameterOpt func(string) string
-}
-
-func NewCol(name string, value interface{}) Column {
-	return Column{
-		Name:  name,
-		Value: value,
-	}
-}
-
-func NewJSONCol(name string, value interface{}) Column {
-	marshalled, err := json.Marshal(value)
-	if err != nil {
-		logging.WithFields("column", name).WithError(err).Panic("unable to marshal column")
-	}
-
-	return NewCol(name, marshalled)
-}
-
-type Condition func(param string) (string, interface{})
-
-type NamespacedCondition func(namespace string) Condition
-
-func NewCond(name string, value interface{}) Condition {
-	return func(param string) (string, interface{}) {
-		return name + " = " + param, value
-	}
-}
-
-func NewNamespacedCondition(name string, value interface{}) NamespacedCondition {
-	return func(namespace string) Condition {
-		return NewCond(namespace+"."+name, value)
-	}
-}