feat(code/test): Dynamic validator set

[bastienfaivre]

Closes: #944

---

PR author checklist

For all contributors

• Reference a GitHub issue
• Ensure the PR title follows the conventional commits spec
• Add a release note in RELEASE_NOTES.md if the change warrants it
• Add an entry in BREAKING_CHANGES.md if the change warrants it

For external contributors

• Maintainers of Malachite are allowed to push changes to the branch

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 0.00%. Comparing base (bbead49) to head (7816ea2).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@     Coverage Diff     @@
##   main   #987   +/-   ##
===========================
===========================

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[ancazamfir]

Great work @bastienfaivre!

[romac]

Nice work! Can you please add entries in RELEASE_NOTE,md and in BREAKING_CHANGES.md? Then we can merge :)

[romac]

Can you please add entries in RELEASE_NOTE,md and in BREAKING_CHANGES.md? Then we can merge :)

Nevermind, it's actually not necessary.