bench: CreateNewBlock with long tx chains
Summary:
This adds two new benchmarks: - Test block generation with a transaction chain of 50 one-input-one-output transactions - Test block generation with a transaction chain of 500 one-input-one-output transactions
Port of bchn#1074.
Depends on D13104.
Test Plan:
ninja bench-bitcoin
Reviewers: #bitcoin_abc, sdulfari
Reviewed By: #bitcoin_abc, sdulfari
Differential Revision: https://reviews.bitcoinabc.org/D13105