BatchMint
Batch Minting is performed using batchMint function
For PNDC_ERC721
    batchMint(
        uint256 _totalNft,
        string[] memory _uri,
        LibShare.Share[][] memory royaltiesSet
    )
- _totalNFT: number of NFTs to mint
 - _uri: array of uri
 - royaltiesSet: nested array of Share struct
 
For TokenERC721
    batchMint(
        uint256 _totalNft,
        string[] memory _uri,
        RoyaltiesSet memory royaltiesSet
    )
- _totalNFT: number of NFTs to mint
 - _uri: array of uri
 - royaltiesSet: RoyaltiesSet struct