[SUGGESTION] Add Claimer for Auction #458
Description
It could be really useful to add whoever claimed the auction to the /auctions_ended endpoint, so that in co-ops it's possible to get who claimed the co-op auction.
Example: Players A, B, and C are in a co-op. Player A creates an auction - it sells, and player B claims it while player A is offline. Player A is now confused what happened to their auction. This variable would give player B's uuid in the auction_ended as claimer, or seller_claimer. A bot/website could keep track of these and allow player A to find out what happened to the auction.