avro

AVRO-3521: "Scale" property from decimal object (#1689)

* AVRO-3521

* Fixed style for "AVRO-3521"

* Changed from 'a positive integer' to 'a non-negative integer' (by RyanSkraba's improvement).

* Update error message in test

Co-authored-by: Ryan Skraba <ryan@skraba.com>