Expand livemode event attribute for sandboxes

When there was only live and test mode the livemode event attribute was enough to know where the event came from. Now with sandboxes I would request additional event attributes that indicate which sandbox the event came from.

For various reasons it would be ideal if both the sandbox name and ID were in the event, but I could work with either

(Reposting as I couldn’t figure out how to change the category of my original post from General to Sandboxes)