chore: move the go code into a subfolder

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

@@ -0,0 +1,24 @@
+package messages
+
+import (
+	"encoding/json"
+
+	"github.com/zitadel/zitadel/internal/eventstore"
+	"github.com/zitadel/zitadel/internal/notification/channels"
+)
+
+var _ channels.Message = (*JSON)(nil)
+
+type JSON struct {
+	Serializable        interface{}
+	TriggeringEventType eventstore.EventType
+}
+
+func (msg *JSON) GetContent() (string, error) {
+	bytes, err := json.Marshal(msg.Serializable)
+	return string(bytes), err
+}
+
+func (msg *JSON) GetTriggeringEventType() eventstore.EventType {
+	return msg.TriggeringEventType
+}