feat: VoteStateV4 goodies#331

ksn6 wants to merge 4 commits into

anza-xyz:masteranza-xyz/solana-sdk:masterfrom

ksn6:convert-vote-state-v4-to-vote-state-v3ksn6/solana-sdk:convert-vote-state-v4-to-vote-state-v3Copy head branch name to clipboard