to_disk: Add type annotations + a simple test for DirectoryBuilder

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Migrated from D8021 (view on Phabricator)

Build is green

Patch application report for D8021 (id=28892)

Rebasing onto 8ac000b4...

Current branch diff-target is up to date.

Changes applied before test

commit 6da99426e215b20f1100abac5cb85a2c72ee183d
Author: Valentin Lorentz <vlorentz@softwareheritage.org>
Date:   Wed Jun 22 15:36:43 2022 +0200

    to_disk: Add type annotations + a simple test for DirectoryBuilder

See https://jenkins.softwareheritage.org/job/DVAU/job/tests-on-diff/239/ for more details.

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