v0.12.0

What's Changed

• feat(yrp): linearizable-read barrier — ensure_linearizable becomes real by @spranab in #69
• feat(yrp): Phase C engine backfill — beyond-GC stragglers heal their engine by @spranab in #71
• feat(yrp): Phase D — delete the openraft cluster path (saga 239) by @spranab in #72

Full Changelog: v0.11.0...v0.12.0