ServiceWeight: PlainDescriptor<{
    proof_size: bigint;
    ref_time: bigint;
} | undefined>

The amount of weight (if any) which should be provided to the message queue for servicing enqueued items on_initialize.

This may be legitimately None in the case that you will call ServiceQueues::service_queues manually or set [Self::IdleMaxServiceWeight] to have it run in on_idle.