Telegram sticker proxy

GET /<set>.json                 pack info + stickers
GET /<set>/thumb                pack thumbnail
GET /<set>/<id>.<webp|tgs|webm> sticker file (id = file_unique_id)
GET /<set>/<id>.json            TGS sticker as Lottie JSON
GET /<set>/<id>/thumb           sticker thumbnail
GET /<set>/<id>/premium         premium animation (if any)
GET /<set>/<id>                 share page