Ariard mentioned he would like to see a test case for a 64-byte transaction spending a Taproot
output with an annex. I took the opportunity to also make the output be an OP_RETURN with a 2-byte
push, as another semi-realistic transaction.
This introduces a set of test vectors for each of the 4 mitigations in the BIP. The sigops and
transaction size vectors were generated using the unit tests included with the Bitcoin Core
implementation of BIP54, available at https://github.com/darosior/bitcoin/tree/2509_inquisition_consensus_cleanup.
The timestamps and coinbases required mainnet blocks for maximum compatibility, and were generated
by two dedicated unit tests not included with the Bitcoin Core implementation above but available at
https://github.com/darosior/bitcoin/tree/bip54_miner.
