Prop 139: [SIPS-130] Co-Incentives Proposal for Turbo CRVUSD

This proposal is intended to authorize a one-time transfer of 287,500 SOMM from the community pool to the CellarStaking contract, which is used to incentivize Turbo CRVUSD cellar depositors on Ethereum Mainnet.

See the corresponding forum post for more details: https://community.sommelier.finance/t/sips-130-upcoming-turbo-crvusd-liquidity-mining-incentives-proposal/1280