CIP-74:Align Solver Rewards with Protocol Revenue and introduce a volume based fee

# Simple Summary CoW Protocol’s current second-price auction uses a fixed reward cap, which suppresses solver rewards on high-value batches and lets rewards exceed protocol fees on low-fee batches (especially on L2s). This CIP replaces the fixed cap with a dynamic cap tied to protocol fees generated by the winning solution, and introduces a very small unconditional volume fee of 2 bps (0.02%). The goal of this CIP is to change the reward mechanism in a way that aligns incentives of solvers...