feat(server/v2/cometbft): Implement necessary handlers and helpers for vote extensions (backport #22830)#23006

julienrbrt merged 2 commits intorelease/v0.52.xcosmos/cosmos-sdk:release/v0.52.xfrom

mergify/bp/release/v0.52.x/pr-22830cosmos/cosmos-sdk:mergify/bp/release/v0.52.x/pr-22830Copy head branch name to clipboard