QueuedSolution: StorageDescriptor<[], {
    compute: ElectionProviderMultiPhaseElectionCompute;
    score: {
        minimal_stake: bigint;
        sum_stake: bigint;
        sum_stake_squared: bigint;
    };
    supports: [SS58String, {
        total: bigint;
        voters: [SS58String, bigint];
    }];
}, true>

Current best solution, signed or unsigned, queued to be returned upon elect.

Always sorted by score.