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.