feat(server/v2/cometbft): Implement necessary handlers and helpers for vote extensions #76545

Job	Run time
split-test-files	12s
test-clientv2	26s
test-core	22s
test-coretesting	21s
test-depinject	30s
test-integration	6m 39s
test-sim-nondeterminism	4m 47s
test-system	12m 54s
test-collections	22s
test-collections-protocodec	27s
test-confix	29s
test-cosmovisor	28s
test-errors	37s
test-hubl	30s
test-indexer-postgres	22s
test-math	36s
test-orm	26s
test-schema	31s
test-schema-testing	29s
test-simapp	50s
test-simapp-v2	5m 33s
test-store	44s
test-log	37s
test-store-v2	40s
test-x-accounts	36s
test-x-accounts-base	27s
test-x-accounts-lockup	28s
test-x-accounts-multisig	20s
test-x-tx	27s
test-x-circuit	25s
test-x-distribution	26s
test-x-evidence	35s
test-x-feegrant	35s
test-x-gov	28s
test-x-group	29s
test-x-nft	27s
test-x-params	30s
test-x-protocolpool	26s
test-x-slashing	27s
test-x-upgrade	29s
test-tools-benchmark	43s
test-x-authz	29s
test-x-bank	38s
test-x-consensus	26s
test-x-epochs	24s
test-x-mint	25s
test-x-staking	25s
tests (00)	8m 31s
tests (01)	3m 44s
tests (02)	4m 10s
tests (03)	4m 31s
repo-analysis	1m 46s
	1h 13m 39s

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