Support approval voting on the governance UI

[hellofromguy]

Describe the bug

Currently the governance page on the UI only supports single choice voting. This means that for single choice votes, a Stalkholder can vote on the proposal without ever exiting the Beanstalk UI. However, with approval voting (which happens with BFCP-Cs), Stalkholders must leave the UI and go to Snapshot in order to vote -- they should be able to select multiple voting choices and vote from the Beanstalk UI.

Here's an example (although the voting period is over): https://app.bean.money/#/governance/0xafac63673dd6eab0e372e55fe66dc5425f026fbcc0f45b025cb0fa74d759181e