Implement stickers.createStickerSet

[aykutalparslan]

Create a stickerset, bots only.

messages.stickerSet#b60a24a6 set:StickerSet packs:Vector<StickerPack> documents:Vector<Document> = messages.StickerSet; ---functions--- stickers.createStickerSet#9021ab67 flags:# masks:flags.0?true animated:flags.1?true videos:flags.4?true user_id:InputUser title:string short_name:string thumb:flags.2?InputDocument stickers:Vector<InputStickerSetItem> software:flags.3?string = messages.StickerSet;