[PRISMA] [PIP-041] Add Stader's ETHx as collateral to mint mkUSD

Quorum: 8.20m CVX

This proposal is to onboard an ETHx vault for minting mkUSD. The suggested vault parameters are conservative and commensurate with ETHx’s risk profile.

Suggested Parameters Mint Cap: 10m mkUSD MCR: 120% Mint Fee: 0% Borrow Interest Rate: 10%

Read more: https://gov.prismafinance.com/t/pip-041-add-staders-ethx-as-collateral-to-mint-mkusd/201