Add linter to ensure chrono::duration is always initialized

Summary:
Follow up to D11759. This avoids accidentially leaving chrono::duration uninitialized which can lead to unexpected behavior.
A reasonable default of 0 has been picked.

Test Plan: Revert D11759, then arc lint

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Subscribers: Fabien

Differential Revision: https://reviews.bitcoinabc.org/D11760