Register ERC20 for axlUSDC, axlUSDT, axlWBTC, axlWETH

Mass Token Registration Proposal. Author: Haqq Association. ERC20 registration for axlUSDC, axlUSDT, axlWBTC, axlWETH. When a proposal is initiated for an existing native Cosmos Coin, the erc20 module will deploy a factory ERC20 contract, representing the ERC20 token for the token pair.