Update USDC, USDT and USDS Comets on Mainnet to support more collaterals

Introducing the AssetListFactory removes contract size constraints, allowing flexible collateral additions for mainnet’s principal markets (USDC, USDT, USDS). This expansion is expected to boost liquidity and strengthen competitiveness, with OpenZeppelin’s audit concerns already addressed. Given strong community support and manageable risks, I believe the benefits outweigh any potential downsides. Thus, a favorable vote is justified.