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