[Addendum] Zero-Fee Pool Transfers

Endorse zero-fee pool transfers for like-assets (ex: vDAI -> vaDAI)

This proposal is superimposed on top of the revenue overhaul proposal, and is dependent on its successful vote.

Discussion: https://gov.vesper.finance/t/addendum-zero-fee-pool-transfers/62 VIP: https://github.com/vesperfi/doc/issues/32