Support serialization of std::vector<bool>
Summary:
PR description:
This adds support for serialization of std::vector<bool>, as a prerequisite of PR16702.
Backport of Core PR16730.
Test Plan: ninja && ninja check
Reviewers: O1 Bitcoin ABC, #bitcoin_abc, deadalnix
Reviewed By: O1 Bitcoin ABC, #bitcoin_abc, deadalnix
Subscribers: deadalnix
Differential Revision: https://reviews.bitcoinabc.org/D7907