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## Problem Storage controller restarts cause temporary unavailability from the control plane POV. See RFC for more details. ## Summary of changes * A couple of small refactors of the storage controller start-up sequence to make extending it easier. * A leader table is added to track the storage controller instance that's currently the leader (if any) * A peer client is added such that storage controllers can send `step_down` requests to each other (implemented in https://github.com/neondatabase/neon/pull/8512). * Implement the leader cut-over as described in the RFC * Add `start-as-candidate` flag to the storage controller to gate the rolling restart behaviour. When the flag is `false` (the default), the only change from the current start-up sequence is persisting the leader entry to the database.