[backport#15195] interfaces: Add remove to Wallet
Summary:
https://github.com/bitcoin/bitcoin/pull/15195/commits/f6122abe03699423faca29035f16f3afc527f4d3
Depends on D6163
Partial backport of Core PR15195
Test Plan:
ninja check
Reviewers: #bitcoin_abc, deadalnix
Reviewed By: #bitcoin_abc, deadalnix
Differential Revision: https://reviews.bitcoinabc.org/D6167