[schema] aggregation-share/sum-part has incorrect cardinality of sum and batch_uuid about prio-server

[tgeoghegan]

You're quite right @tlepoint, and Yuri and I realized as much last Friday, but failed to say as much in this issue. I think what I currently have in #2 is consistent with what you're saying.

[tlepoint]

Actually, the sums array needs to be an array, because the sum is done over a vector containing n bins. We can choose the terminology that you prefer (one sum of a vector, or many individual sums, the current avro file choosing the latter formulation). In the original proto schema, sum was represented as bytes (assuming proper serialization): I modified this to be int64 to be consistent with the f_r, g_r, h_r, and r_pit terms.

Thanks for catching the error for the batch_uuid, this indeed should be an array. I may have been thrown off by the comment above the batch_uuid field.

[tgeoghegan]

Addressed in #2. Please file a new issue for further schema amendments, referencing this one if necessary.