Add an 'is_archived' flag to the tag API response

As per the title suggests, currently there is no way to tell if a tag returned by the 'List tags' endpoint is archived or not (please correct me if Im wrong).

As Im trying to automate the process of tagging email, I recently ran into an issue where I get a 400 error from the conversation API saying the tag ID that I have provided is for an archived tag. Currently there is no way for me tell if a tag is active or archived.