fix: event marshalling

pkg/msgbus/service.go

@@ -337,10 +337,10 @@ func (e *PostEvent) SetEventMeta(eventMeta event.Meta) {
 	}
 	e.eventMeta = eventMeta
 }
-func (e *PostEvent) MarshalText() ([]byte, error) {
+func (e *PostEvent) MarshalBinary() ([]byte, error) {
 	return json.Marshal(e)
 }
-func (e *PostEvent) UnmarshalText(b []byte) error {
+func (e *PostEvent) UnmarshalBinary(b []byte) error {
 	return json.Unmarshal(b, e)
 }