Add cross-basek normalization (#90)

* added cross_basek_normalization

* updated method signatures to take layouts

* fixed cross-base normalization

fix #91
fix #93

poulpy-hal/src/layouts/vec_znx_big.rs

@@ -179,10 +179,10 @@ impl<D: DataRef, B: Backend> fmt::Display for VecZnxBig<D, B> {
         )?;
 
         for col in 0..self.cols {
-            writeln!(f, "Column {}:", col)?;
+            writeln!(f, "Column {col}:")?;
             for size in 0..self.size {
                 let coeffs = self.at(col, size);
-                write!(f, "  Size {}: [", size)?;
+                write!(f, "  Size {size}: [")?;
 
                 let max_show = 100;
                 let show_count = coeffs.len().min(max_show);
@@ -191,7 +191,7 @@ impl<D: DataRef, B: Backend> fmt::Display for VecZnxBig<D, B> {
                     if i > 0 {
                         write!(f, ", ")?;
                     }
-                    write!(f, "{}", coeff)?;
+                    write!(f, "{coeff}")?;
                 }
 
                 if coeffs.len() > max_show {