Script to migrate governance.rewards() to Governance multisig

[dapp-whisperer]

The vault controller currently forwards fees that are bound to governance to the Badger Aragon DAO. We've since decided to move the treasury to the Governance Multisig until we 100% figure out the next stage of the decentralization plan.

Create a script that changes the rewards() address of the controller to the governance multisig.

This script will need to pass through the governance timelock (based on compound governance module). You can see examples of programmatically doing this on forknet here and here.

The crvRen Sett that deposits into Harvest is on a separate controller that will also need to have it's rewards address changed.

Here is an example of a script upgrading things through the timelock.