AddAttribute adds a cloudevents attribute (if missing) during the encoding process.

AddExtension adds a cloudevents extension (if missing) during the encoding process.

DeleteAttribute deletes a cloudevents attribute during the encoding process.

DeleteExtension deletes a cloudevents extension during the encoding process.

SetAttribute sets a cloudevents attribute using the provided function.

SetExtension sets a cloudevents extension using the provided function.

Version converts the event context version to the specified one.

Add the cloudevents time attribute, if missing, to time.Now().