[backport#16117] util: Add UnintrruptibleSleep

Summary:
https://github.com/bitcoin/bitcoin/pull/16117/commits/fa4620be782c2bf6b5ffddf4f671194fdd1536f3

Partial backport of Core PR16117

Test Plan:

ninja check

Reviewers: #bitcoin_abc, deadalnix

Reviewed By: #bitcoin_abc, deadalnix

Differential Revision: https://reviews.bitcoinabc.org/D6517