Revert "fix(eventstore): use decimal for position (#9881)"

This reverts commit e14639c0ad.

internal/eventstore/v1/models/event.go

@@ -5,8 +5,6 @@ import (
 	"reflect"
 	"time"
 
-	"github.com/shopspring/decimal"
-
 	"github.com/zitadel/zitadel/internal/eventstore"
 	"github.com/zitadel/zitadel/internal/zerrors"
 )
@@ -22,7 +20,7 @@ var _ eventstore.Event = (*Event)(nil)
 type Event struct {
 	ID               string
 	Seq              uint64
-	Pos              decimal.Decimal
+	Pos              float64
 	CreationDate     time.Time
 	Typ              eventstore.EventType
 	PreviousSequence uint64
@@ -82,7 +80,7 @@ func (e *Event) Sequence() uint64 {
 }
 
 // Position implements [eventstore.Event]
-func (e *Event) Position() decimal.Decimal {
+func (e *Event) Position() float64 {
 	return e.Pos
 }