[backport#15368] Add getdescriptorinfo to compute checksum

Summary:
https://github.com/bitcoin/bitcoin/pull/15368/commits/b52cb6368869c9f6dd2cd8f309b3000de514d439

Depends on D6600

Partial backport of Core PR15368

Test Plan:

ninja
test_runner.py wallet_address_types

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D6601