Dynamic Borrow/Deposit Rewards Split

Rationale: Since the implementation of liquidity mining rewards on April 26, deposit volume has outpaced borrow volume for stablecoins, leading to decreased utilization and deposit rates.

Proposal: Modify the borrow/deposit rewards split for each asset to dynamically adjust based on the utilization rate. Each asset in AAVE has an optimal utilization rate (https://docs.aave.com/risk/liquidity-risk/borrow-interest-rate#interest-rate-model). By skewing the deposit/borrow rewards depending on the current utilization compared to optimal, it will incentivize AAVE users to push interest rates towards a stable equilibrium.

Given that the optimal utilization rate is set lower for non-stablecoins, this model can be applied to these assets as well.

A diagram of the proposed model is in the discussion below.

Discussion: https://governance.aave.com/t/arc-extend-aave-liquidity-mining-rewards/4852