refactor!: Use NonZero<T> in DataKind

Change the type used to store a block count in
DataKind to NonZero. This makes it impossible to store
'empty' kinds such as DataKind::Unsigned(0), DataKind::Signed(0).

Also, when deserializing, if the count is zero and error will be
returned, adding an additional layer of sanitization.

utils/tfhe-versionable/src/lib.rs

@@ -18,7 +18,7 @@ use std::convert::Infallible;
 use std::error::Error;
 use std::fmt::Display;
 use std::marker::PhantomData;
-use std::num::Wrapping;
+use std::num::{NonZero, Wrapping};
 use std::sync::Arc;
 
 pub use derived_traits::{Version, VersionsDispatch};
@@ -268,6 +268,9 @@ impl_scalar_versionize!(f64);
 
 impl_scalar_versionize!(char);
 
+impl_scalar_versionize!(NonZero<u32>);
+impl_scalar_versionize!(NonZero<usize>);
+
 impl<T: Versionize> Versionize for Wrapping<T> {
     type Versioned<'vers>
         = Wrapping<T::Versioned<'vers>>