chore[dtype]: use NonZero fro decimal precision

Signed-off-by: Joe Isaacs <[email protected]>

Author: joseph-isaacs

vortex-dtype/src/decimal/mod.rs

@@ -23,6 +23,7 @@ const MAX_SCALE: i8 = <i256 as NativeDecimalType>::MAX_SCALE;
 /// Parameters that define the precision and scale of a decimal type.
 ///
 /// Decimal types allow real numbers with a similar precision and scale to be represented exactly.
+/// Precision must be non-zero.
 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct DecimalDType {