chore: move the go code into a subfolder

apps/api/internal/v2/projection/projection.go

@@ -0,0 +1,20 @@
+package projection
+
+import "github.com/zitadel/zitadel/internal/v2/eventstore"
+
+type projection struct {
+	instance string
+	position eventstore.GlobalPosition
+}
+
+func (p *projection) reduce(event *eventstore.StorageEvent) {
+	if p.instance == "" {
+		p.instance = event.Aggregate.Instance
+	}
+	p.position = event.Position
+}
+
+func (p *projection) shouldReduce(event *eventstore.StorageEvent) bool {
+	shouldReduce := p.instance == "" || p.instance == event.Aggregate.Instance
+	return shouldReduce && p.position.IsLess(event.Position)
+}