[Constitutional] AIP: Transition Arbitrum One ordering policy to Priority Gas Auctions (PGA)

Cornell Blockchain is voting FOR this proposal because we support any initiative that lowers the barrier of entry for smaller parties to compete with bigger players, and are against the monopolization of Timeboost by 3 parties. Since Timeboost captures ~2% of atomic arbitrage revenue, with the overwhelming majority of arb and liquidation activity bypassing it entirely, then switching to PGA to bring more funds to the DAO makes sense. We also appreciate the clarification that the private mempool will protect users from sandwich attacks under PGA. Additionally, we second @abel189 comment that the transaction costs should be closely monitored, especially the choice of the k parameter, to ensure that the anti-starvation measure is working as intended.