current_epoch: RuntimeDescriptor<[], {
    authorities: [FixedSizeBinary<32>, bigint][];
    config: {
        allowed_slots: BabeAllowedSlots;
        c: FixedSizeArray<2, bigint>;
    };
    duration: bigint;
    epoch_index: bigint;
    randomness: FixedSizeBinary<32>;
    start_slot: bigint;
}>

Returns information regarding the current epoch.