[Stacks 2.1] Support `coinbase-pay-to-alt-recipient` transactions
Support coinbase-pay-to-alt-recipient transactions, see https://github.com/stacks-network/stacks-blockchain/pull/3164
Blocked by bug in the stacks-node, see https://github.com/stacks-network/stacks-blockchain/issues/3258
Support implemented in https://github.com/hirosystems/stacks-blockchain-api/pull/1283
However, STX balances will be reported incorrectly for miners who use the new coinbase-pay-to-alt due to https://github.com/stacks-network/stacks-blockchain/issues/3258
Once that bug is fixed on the Stacks-node then it should also be fixed in the API without additional changes.
Closed with https://github.com/hirosystems/stacks-blockchain-api/pull/1413 + https://github.com/stacks-network/stacks-blockchain/pull/3373