addParticipant method
Implementation
Future<Topic> addParticipant(String entityId, String dataOwnerId, TopicRole topicRole) async {
	return await CardinalSdkPlatformInterface.instance.apis.topic.tryAndRecover.addParticipant(
		_sdkId,
		entityId,
		dataOwnerId,
		topicRole,
	);
}