Add cosigner in 1155M & conditionally enforcing mint fee

[channing-magiceden]

• Add cosigner into 1155M, similar to 721M
• Leverage cosignature to determine whether to waive mint fee
• Signed signature:

  keccak256(
    abi.encodePacked(
        address(this),
        minter,
        qty,
        waiveMintFee,   // the new bool field
        _cosigner,
        timestamp,
        block.chainid,
        getCosignNonce(minter, tokenId)
    )
  )