Prop 208: Add dYdX Operations subDAO signer as market authority to market map and remove revenue share

Adding dYdX Operations subDAO signer as a market authority so it can update dYdX's x/marketmap with the MMU. Further details can be found in the proposal description: https://dydx.forum/t/drc-add-dydx-operations-subdao-signer-as-market-authority-to-market-map-and-remove-revenue-share/3323