feat: pox-4 support #1812

Job	Run time
test	3m 11s
lint	1m 0s
lint-docs	1m 3s
test-event-replay	1m 38s
test-bns	1m 48s
test-btc-faucet	1m 13s
test-rpc	1m 15s
test-subnets	2m 31s
test-2_4 (block-zero-handling)	1m 18s
test-2_4 (faucet-stx)	1m 12s
test-bns-e2e	1m 48s
test-2_4 (pox-3-btc-address-formats)	2m 3s
test-2_4 (pox-3-delegate-aggregation)	1m 32s
test-2_4 (pox-3-delegate-stacking)	1m 45s
test-rosetta	1m 38s
test-2_4 (pox-3-delegate-revoked-stacking)	1m 35s
test-2_4 (pox-3-stack-extend-increase)	1m 20s
test-2_4 (pox-3-rosetta-btc-addr-types)	4m 33s
test-2_4 (pox-3-rosetta-cycle-phases)	5m 6s
test-rosetta-construction	1m 35s
test-2_4 (pox-3-rosetta-segwit)	1m 44s
test-2_4 (pox-3-burnchain-stack-stx)	1m 36s
test-2_4 (pox-3-burnchain-delegate-stx)	1m 10s
test-rosetta-cli-data	1m 47s
test-rosetta-cli-construction	6h 0m 18s
build-publish	0s
	6h 45m 39s

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