add youtubevis 2021 label file

youtubevis_2021-instance-id2label.json

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+{"0": "airplane", "1": "bear", "2": "bird", "3": "boat", "4": "car", "5": "cat", "6": "cow", "7": "deer", "8": "dog", "9": "duck", "10": "earless_seal", "11": "elephant", "12": "fish", "13": "flying_disc", "14": "fox", "15": "frog", "16": "giant_panda", "17": "giraffe", "18": "horse", "19": "leopard", "20": "lizard", "21": "monkey", "22": "motorbike", "23": "mouse", "24": "parrot", "25": "person", "26": "rabbit", "27": "shark", "28": "skateboard", "29": "snake", "30": "snowboard", "31": "squirrel", "32": "surfboard", "33": "tennis_racket", "34": "tiger", "35": "train", "36": "truck", "37": "turtle", "38": "whale", "39": "zebra"}