chore: move the go code into a subfolder

apps/api/internal/notification/messages/sms.go

@@ -0,0 +1,29 @@
+package messages
+
+import (
+	"github.com/zitadel/zitadel/internal/eventstore"
+	"github.com/zitadel/zitadel/internal/notification/channels"
+)
+
+var _ channels.Message = (*SMS)(nil)
+
+type SMS struct {
+	SenderPhoneNumber    string
+	RecipientPhoneNumber string
+	Content              string
+	TriggeringEventType  eventstore.EventType
+
+	// VerificationID is set by the sender
+	VerificationID *string
+	InstanceID     string
+	JobID          string
+	UserID         string
+}
+
+func (msg *SMS) GetContent() (string, error) {
+	return msg.Content, nil
+}
+
+func (msg *SMS) GetTriggeringEventType() eventstore.EventType {
+	return msg.TriggeringEventType
+}