collect_collation_info: RuntimeDescriptor<
    [
        header: {
            digest: DigestItem[];
            extrinsics_root: FixedSizeBinary<32>;
            number: number;
            parent_hash: FixedSizeBinary<32>;
            state_root: FixedSizeBinary<32>;
        },
    ],
    {
        head_data: Binary;
        horizontal_messages: { data: Binary; recipient: number }[];
        hrmp_watermark: number;
        new_validation_code?: Binary;
        processed_downward_messages: number;
        upward_messages: Binary[];
    },
>

Collect information about a collation.

The given header is the header of the built block for that we are collecting the collation info for.