Add tests for the Branch and Bound algorithm

Summary:
This ia partial backport of Core PR10637 : https://github.com/bitcoin/bitcoin/pull/10637/commits/4566ab75f277612425337bf7786c1d3a410d894a

Depends on D3250

Test Plan:

make check

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Subscribers: Fabien

Differential Revision: https://reviews.bitcoinabc.org/D3252